Is Daylight Saving Time Bad For You? 333
Hugh Pickens writes "According to experts on circadian rhythms, the hour shift in sleep schedule from Daylight Saving Time can have serious effects on some people's health, particularly in people with certain pre-existing health problems. One study found that men were more likely to commit suicide during the first few weeks of Daylight Saving Time (DST) than at any other time during the year, and another study showed that the number of serious heart attacks jumps 6% to 10% on the first three workdays after DST begins. Dr. Xiaoyong Yang, an assistant professor of comparative medicine and cellular and molecular physiology at Yale University, theorizes that shifts in biologic rhythms could trigger harmful inflammatory or metabolic changes at the cellular level, to which these individuals may be more susceptible."
Yep (Score:2, Interesting)
It may not seem like much, but even shifting things by a single hour and put me (and people like me) a very difficult spot. Light boxes and sunrise simulator alarm clocks help, but what helps the most is strict consistency in sleep/wake times. This is especially harmful to people wit
Re:Yep (Score:5, Insightful)
If it's really a health issue, why adjust your sleep schedule to match the changing clock? Can't you simply get up an hour earlier during winter?
Re:Yep (Score:5, Funny)
I'm already waking up before the crack of noon. I don't know how much earlier you expect me to get up.
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I'm not sure what you're saying. I do get up an hour earlier in the summer, I certainly could do so without changing my clocks (though that would seem like a silly and pointless exercise, since the everyone around me changes their clocks), and I'm not regulating anyone! Perhaps you mistook my practical suggestion for pro-DST advocacy?
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I'm not sure what you're saying. I do get up an hour earlier in the summer, I certainly could do so without changing my clocks (though that would seem like a silly and pointless exercise, since the everyone around me changes their clocks), and I'm not regulating anyone! Perhaps you mistook my practical suggestion for pro-DST advocacy?
Yes, I did. Good day to you, sir. :)
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Yeah, and I suppose it would just be a "waaaah" issue if the guy had narcolepsy or something along those lines? Surely we can cure all our mental problems just my manning up, after all it's just in our head! Surely chemical differences in our brain can't make that much difference to the way our mind works? If they did, then everyone would be drinking caffeine and alcohol, eating sugary foods and taking drugs all the time to make themselves temporarily feel better about their shitty little lives! Oh, wait..
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> If it's really a health issue, why adjust your sleep schedule to match the changing clock?
Because neither work nor school will adjust their schedules for him?
Yes, that's why I suggested getting up an hour earlier in winter rather than the otherwise-equivalent change of getting up an hour later in summer, which would make him late.
Frankly, DST should be abandoned entirely
But it hasn't been, and unless and until it is, this guy has to live with it. Are you suggesting that he should continue to risk his health and mental well-being just to try to prove your point? I gotta say, I'm not very comfortable with demanding that someone else martyr themselves for my cause, no matter how much I think they may a
DST or time of year? (Score:2)
The question I have is how much does DST have to do with it and how much is simply the time of year? It is possible that people are simply trying to stay awake longer than the available light. I have read elsewhere that being up after dark is not good for you, though like every other study I have to ask myself how much is this based in the factor being studied and how much is this simply a life-style factor?
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I'd guess you've never been to Arizona.
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The rest of us, the majority... we live in perpetual Twilight.
Could be worse...could be living in the Twilight Realm...
People who travel? (Score:5, Insightful)
How does this compare to people who travel one time zone over, let alone multiple time zones? Aren't these people (millions) in worse shape?
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This is a related problem. But unlike travel which can be mitigated by either avoiding it or traveling by car/train, DST is something that's imposed by the government and cannot easily be avoided if you're in an area that observes it. Few employers are going to let you come in late to avoid having your circadian rhythm disrupted.
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This is a related problem. But unlike travel which can be mitigated by either avoiding it or traveling by car/train
How? If one hour is a problem, you'll have a problem crossing any timezone. And if you're travelling multiple time zones, it's not likely your boss will pay for days of travel each way either. To be honest this might be triggering on the statistics, but those people must be pretty fragile to begin with. It's like how they say the flu kills thousands each year - the weak and elderly that can't take it, but it's only the last straw and something would have did them in.
Re:People who travel? (Score:4, Interesting)
DST is something that's imposed by the government and cannot easily be avoided if you're in an area that observes it.
You could always move. Arizona doesn't observe DST.
Some people move to dry or warm climates for reasons related to health. This isn't really that much different.
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Hawaii then?
Re:People who travel? (Score:4, Interesting)
So get up an hour earlier during winter rather than an hour later during summer, and you won't have to come in late or have your circadian rhythms disrupted.
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Indiana Jones has his own timezone? Oh, wait, that was Chuck Norris. ;-)
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Hmm? I always thought Indiana was split between many time zones (with neighboring states' major cities). Are these articles wrong?
http://www.infoplease.com/spot/daylight1.html [infoplease.com]
https://secure.wikimedia.org/wikipedia/en/wiki/Time_in_Indiana [wikimedia.org]
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>>Try working on the border between Illinois and Indiana, not only is there a timezone changeover, Illinois uses DST while Indiana does not. If I'm not mistaken part of the year their clocks match, and part of the year they're three hours different.
I do work in central Indiana, and it's really really annoying. Not only do they not use DST, but their time zone splits the state in half, so an airport 20 miles away might be an hour ahead or behind your time at the hotel.
I would have missed a flight once
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I do work in central Indiana, and it's really really annoying. Not only do they not use DST, but their time zone splits the state in half
Not in the last few years you haven't. Indiana switched to DST in 2005. Arizona and Hawaii are the last holdouts of sanity.
Lengthening the Blanket... (Score:5, Insightful)
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While your analogy is correct, it misses the point.
I stopped and looked at it one day. in NY the sun sets on Sept.1st at about 8:30pm. without daylight that means it sets at 7:30pm The northern states would literally lose the ability to do many things they can now simply because it will get dark out in August and September, instead of October.
Evening sports, afterwork hobbies, anything that one does after 5pm(when most people stop working) will lose time to do things like mow the yard afte
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No wait.. what you seem to want is to stop work at 4pm instead of 5pm but you still want to call it 5pm? Then, you want to start work at 8am instead of 9am but you want to call it 9am? I think I'm getting this now.. so you want to have lunch at 12noon but call it 1pm!?
Of course, some people don't have friendly employers and require that the government mandate the hours that they work.. but it sounds like a pretty hackish solution..
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Of course, some people don't have friendly employers and require that the government mandate the hours that they work.. but it sounds like a pretty hackish solution..
It's funny that people are opposed to the "government imposed" daylight savings time, but don't seem to mind the government imposed timezones them self. You would think that timezones would follow straight lines, but they don' t they follow the border of states. Darn government interfering with everything.
Personally, I think it's a good idea not having a bunch of kids standing in the dark waiting for a school bus during the winter. It's also nice to still have some light to get things done around the hou
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You know, those of us who want the extra daylight could just get up an hour earlier and go into work earlier.
I can do that. However, I was under the impression the majority of people actually work for someone else, often at companies or organizations that have a set schedule. "You know, those of you who want this can just quit your jobs." Uh huh...
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You know, those of us who want the extra daylight could just get up an hour earlier and go into work earlier.
And if you work are in management in an office building that might work. But if you work in a factory or a retail venue, that isn't an option. And, what about sending the kids to school?
A better solution would be that people just get up when they need to. If the switch over is a problem, then start a week early adjusting your alarm 10 minutes a day so by the time the clocks do change, you're in synch with them.
Re:Lengthening the Blanket... (Score:5, Interesting)
The only thing "daylight savings time" does is force, by government decree, that EVERYBODY must do this at the SAME time, in lockstep.
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That doesn't work for people in say retail who don't get those hours. or for people at restaurants, who work regular shifts.
by forcing everyone to do it lockstep the government makes sure it actually gets done.
Because 99% of business will say you still have to work 8am to 5pm look at all the problems of doing things like telecommute.
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That doesn't work for people in say retail who don't get those hours. or for people at restaurants, who work regular shifts.
by forcing everyone to do it lockstep the government makes sure it actually gets done.
Because 99% of business will say you still have to work 8am to 5pm look at all the problems of doing things like telecommute.
Doesn't work very well for school students, either.
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I think the benefits of the system are being curtailed by the fact it's being applied by longitude instead of latitude.
As most know, the differences in sun rise and sun set align along the latitude (local solar time), yet the daylight savings adjustments are currently aligned against the averaged time zones by longitude. This was the easiest way to do it and it seems to be holding back the system (based off studies).
If instead they setup latitude DST to run perpendicular to the date lines, we'd definitely s
Re:Lengthening the Blanket... (Score:4, Funny)
Stick everybody on GMT / UTC / Zulu (whatever you want to call it) and just deal with it.
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Evidently you're not old enough to remember Eastern War Time (when daylight was extended two hours).
Extending daylight means that activities that occur in the early evening are performed with the sun still out, which has various advantages, the primary being related to energy consumption-- less heat is needed, less electricity for lights, etc. There are various secondary arguments, such as fewer accidents.
http://en.wikipedia.org/wiki/Daylight_saving_time [wikipedia.org] .
Please google the topic before opening your
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Because not everyone's going to do that, without a law. You can get up at five, maybe you can convince your boss to open the business at 8 instead of 9... the school board is another issue...
this is a simple way to do it, without having to get anyone on board, without co-ordination, without having to reprint schdules. Hello guys-- 9am is now 8am.
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Simply? Not everyone will do it, and you'll have a mishmash of people going to work earlier and some going to work later.
In late June, NYC would wind up with a 4:20 am sunrise and 7:30pm sunset. Yet events will still have to happen at their regular time, due to the mix of people with Summer and Winter hours. So you'll see no benefit reducing electrical use for large venues. (Baseball, for example, the lights will be on for more of the game).
Sorry, this is one of those things where the government should be m
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look, we all know it makes sense to have sunlight in the evening. but why not simply start work earlier? get up at 5 instead of 6, go to bed at 22 instead of 23, problem solved.
Well, DST effectively does that, doesn't it?
In other news (Score:3)
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It *IS*.
If you need the alarm most of the time, you're not getting enough sleep. That, in turn leads to depression and possibly other disorders.
Time to solve the problem (Score:4, Insightful)
To solve the problem is VERY simple, but the politicians don't like it. When you move to summer time, move the clocks 1/2 hour forward instead of 1 hour... and then LEAVE them there. No more going forwards and backwards wasting time changing countless clocks and gadgets, and no more bickering about moving the timezone multiple hours forward like the UK had recently just to please some European fascists.
Recent campaign for UK to be on Berlin Time [dailymail.co.uk]
Portugal wants to move back to GMT [dailymail.co.uk]
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I agree about DST, though I don't see the point in being a half-hour out of synch with GMT. It just makes the mental math harder.
I'd say just do away with daylight savings time the next time it comes around. You'd need to give everybody at least a year's notice anyway, so that devices can be updated and gotten into the retail channels.
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"What that means is that if every one of 110 million American households bought just one ice-cream-cone bulb, took it home, and screwed it in the place of an ordinary 60-watt bulb, the energy saved would be enough to power a city of 1.5 million people. One bulb swapped out, enough electricity saved to power all the homes in Delaware and Rhode Island. In terms of oil not burned, or greenhouse gases not exhausted into the atmosphere, one bulb is equivalent to taki
Something is wrong there. (Score:2)
Since there are only around 300 million people in the USofA ... and none of them can drive more than 1 car at a time ...
All we'd need to do to completely eliminate the carbon footprint of our cars is to ...
Replace 300 bulbs.
Or 100 people replace 3 bulbs each.
I think your time scales are out of sync.
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You have no idea what you are talking about:
"What that means is that if every one of 110 million American households bought just one ice-cream-cone bulb, took it home, and screwed it in the place of an ordinary 60-watt bulb, the energy saved would be enough to power a city of 1.5 million people. One bulb swapped out, enough electricity saved to power all the homes in Delaware and Rhode Island. In terms of oil not burned, or greenhouse gases not exhausted into the atmosphere, one bulb is equivalent to taking 1.3 million cars off the roads."
http://www.fastcompany.com/magazine/108/open_lightbulbs.html
I assume by "ice-cream-cone bulb" you mean compact fluorescent. The numbers show (at least in Canada) that they save electricity for the consumer but use significantly more electricity to produce and dispose of than incandescents (it takes 1.7kw/hour to produce a CFL vs .11kw/hour). Canada, New Zealand, and others are now rethinking their ban on incandescent bulbs as CFLs actually have a heavier carbon footprint than 60 watt incandescents.
The problem is psychological, not physiological (Score:5, Insightful)
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>>People genuinely believe they are getting "an extra hour of daylight"
They are. People that aren't farmers don't care about daylight in the morning time, but they do care about it when they get off work. So it's exactly like getting a free hour of daylight from a utility point of view.
DST should be made permanent.
Re:The problem is psychological, not physiological (Score:5, Insightful)
Sure it's trivial that the number of physical hours of daylight in a 24 hour period doesn't change by changing the clocks, but that's never been the reason to do so. The reason is that people's lives are regulated by clocks. They get to work at 9, and leave at 5, or whatever the hours are. That also means they sleep during the "night" that's defined by those clocks.
The point of daylight savings is that the work hours and night hours are shifted, so that during the period when they are awake and working and living, the amount of daylight is, actually, truly, increased. Also, during the period when the clocks say it's time to sleep, the amount of darkness is increased.
Daylight savings is a great idea, and will continue to be a great idea for as long as human societies are using clocks to synchronize economic activity.
It didn't used to be like that. In medieval or ancient times, people's days started at dawn and ended at sunset, and that was the economic regulator. They didn't have appointments at ten, meetings at two, eight working hours etc. Instead they had longer work days in summer, shorter work days in winter, and meetings around midday, plus or minus a few hours.
I can't believe I have to spell this out on slashdot.
Re:The problem is psychological, not physiological (Score:5, Interesting)
Except that it's all backwards.
In the spring, we should be moving the clocks *back* an hour. That way, it would actually be dark outside before midnight in the summer, allowing us to actually sleep in *darkness*.
Then, in the fall, we should be moving the clocks *ahead* an hour, so that it's actually light outside when we wake up, and it's *still* light outside when we are done work, giving us more "after work daylight".
The current "daylight savings rules" are completely bass-ackwards!
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Actually, the primary point of the "extra hour of daylight" is that (in the eyes of Congress at least) it encourages people to go out and shop during the summer evenings. That's why the latest changes to when DST started and stopped were billed as a measure to revive the economy.
Practicality, or the free time available to us peons, had nothing to do with it.
Mandatory National Twice-Yearly Jet Lag (Score:2)
Goddamn right, Daylight Savings Time is bad for me.
It fucks with my sleep cycle -- messes it up for a week or more -- every six months, like fucking clockwork.
Repeal it, stop it, get rid of it forever.
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If it affects you that strongly, why not try getting up 15 minutes earlier every few days for the couple of weeks preceding it so you'll be eased into it instead of shifting entirely at once?
I've got another theory... (Score:2)
theorizes that shifts in biologic rhythms could trigger harmful inflammatory or metabolic changes at the cellular level, to which these individuals may be more susceptible."
...OR "Shit shit shit shit I'm late for work I'm gonna be fired again!" gets to you ...
Everytime I read one of these "studies" that "shows" stuff, I can't help but think that the researcher is a press whore or is just trying to get more funding by throwing out a ridiculously convoluted "theory" to explain a simple observation. After all, the "people get stressed out when they're late for work" hypothesis doesn't get you as many grants.
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theorizes that shifts in biologic rhythms could trigger harmful inflammatory or metabolic changes at the cellular level, to which these individuals may be more susceptible."
...OR "Shit shit shit shit I'm late for work I'm gonna be fired again!" gets to you ...
Everytime I read one of these "studies" that "shows" stuff, I can't help but think that the researcher is a press whore or is just trying to get more funding by throwing out a ridiculously convoluted "theory" to explain a simple observation. After all, the "people get stressed out when they're late for work" hypothesis doesn't get you as many grants.
One fall Saturday night, I jokingly "reminded" my friend to turn his clock forward because of the time change - I said "Remember, fall forward, spring back". I figured his wife would catch the joke and correct him, and move the clock back an hour. Instead, he showed up for the 6AM restaurant opening time at 4 in the morning - which meant he must have gotten up at 2:30 AM ...
So he's sitting in the mall parking lot all by himself, wondering where everyone is, when the police pull up to find out why some b
Turn the clock back 23 hours, instead of one ahead (Score:3)
Turing the clock one hour ahead is bound to screw people up. So why not just turn the clock back 23 hours? The time will be the same, and we all can take that extra "Daylight Savings Day" as an opportunity to lounge around, doing nothing productive.
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Actually, I think that if the switch to Standard Time occurred at 2am on a Monday, and then the switch to DST occurred at 4pm on a Friday, everyone would be happy.
It basically gives you an hour longer to sleep in on a Monday in the fall, and lets you off work an hour early on a Friday in the spring, giving you the weekend to start re-adjusting. Everyone gets what they want with the least amount of stress.
microscopic political motivation (Score:2)
"People are out of work!" "People are starving!" "We'
Average? (Score:4, Interesting)
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Why change it at all?
Really, if you shift your schedule... What to you miss? TV. TV is the problem here. The fact that shows are broadcast at a certain time. I predict (and hope) one day soon we'll be able to get The Daily Show and Colbert Report, when it is done production, and available on-demand. That way, you can watch them at any time. Without favorite TV shows to control our bed time, we can get as much sleep as we need. If you're willing to be a day behind that reality can be now. But it makes for ha
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Why don't they average it out to half an hour and just leave it there? Instead of swapping an hour twice a year, swap half an hour one time and don't bother doing it again.
Maybe because moving just half an hour will have the US half an hour off the time zones from the rest of the world.
Semi Annual DST rant (Score:5, Informative)
Healthy Stressless Society? (Score:2)
Get rid of it and adjust schedules... (Score:3)
As someone that has to deal with DST and timezones in the IT world I say we go with straight GMT and get rid of all of the rest. Then let local areas adjust accordingly. So in central time zone areas we go to work @ 14:00 GMT and get off at @ 23:00...
Stopped changing my sleep schedule last year... (Score:2)
...and it's been working out fine thus far.
Back during the last time change (autumn of 2010), I decided to not change my alarm clock's time. My computer and laptop would auto-adjust, and I'd still have to change the times on my DSLR camera, e-reader, and Nintendo DS. But the alarm clock time remains the same. When the alarm clock shows "9:30 PM", I go to bed (even though it's actually 8:30 PM). When the alarm clock shows "4:00 AM" (even though it's actually 3:00 AM), it sounds and I wake up.
The effect i
It's logic. It's not bad for you at all (Score:2)
We have daylight savings to *save daylight*. Because in winter-time, we have less sun.
The human mind is closely connected to the sun. Less sun means less happines. Your health might also be connected to this. E.g. you move less when there is less sun, and you get less excercise.
I also have to point that there seem to be no study that proves that removing DST means less suicides or heart attacks.
Hi (Score:5, Interesting)
My name is BMO and I live in Rhode Island. We here in the Northeast US are far enough east that during the winter, we go to work in the dark and we come home in the dark. Unless you have windows in your office or stock room or machine shop, or whatever, you never see the sun except on weekends. It's like being divorced and having partial custody - of sunlight.
The Eastern time zone is so wide that it stretches all the way to the Eastern border of Illinois. This is just nuts. When DST finally shows up in March, suddenly the sun sets at a reasonable hour.
New England and NY should secede from the Union and join the Maritime Provinces simply to get a sane time zone.
I'm sorry for ranting, but I'm tired of my Seasonal Affective Disorder and I can't wait for DST to get here. See? My SAD is showing!
--
BMO
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Actually, I can't imagine the summers up there -- I live in the South, and find the idea of sunlight at 9 pm somewhat disturbing. Then again, I
DST has nothing to do with daylight (Score:2)
DST starts roughly 80 days after the solstice and ends roughly 50 before the soltice. Changing clocks based onthe season rather than the actual amount of daylight or the time of sunrise is wasteful.
Simple way to END Daylight Savings Time (Score:2)
For those areas affected, for the next DST, just go 30 minutes in the appropriate direction and then STOP CHANGING THE CLOCKS FOREVER AFTER.
Tada, Simple cure and one final gig for the Y2K / DST programmers.
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Brilliant, then you need to deal with half hours every time you convert to/from UTC.
Good for many, bad for some. (Score:2)
Having DST in winter is useless because of that later rise of the sun, around my place it'd mean the sun would only rise around 10 o'clock.
When I hear about the health issues of some it makes me wonder how they cope with a night out in town...
And non-Soviet Russia (Score:3)
has already decided to end daylight-saving time [telegraph.co.uk]. :) Heck, Arizona lived without DST without problems...
Because "power savings" from this back-and-forth are 0.2%. And hassles from switch time are simply not worth it
Obvious solution (Score:2)
Changing the clock is idiotic. If anything, working times should be shifted, not "time" itself.
For the last years, since I don't watch broadcasted TV anymore, I only became aware of the DST day because my computers showed a different time than the clock in my microwave.
Traffic accidents (Score:2)
DST is also known to significantly boost traffic accidents after the switch, as people are tired and make more mistakes while driving.
It's time to abandon this archaic switch.
Blame Benjamin Franklin! (Score:2)
Blame Benjamin Franklin!
It was actually he who suggested it!
http://www.webexhibits.org/daylightsaving/franklin3.html [webexhibits.org]
It is very witty!
One size does not fit all (Score:3)
Here in Canada, most of us are far enough north that our summers are bright, DST or not. Here in Vancouver at "only" 49 degrees north, the latest sunset (if we stayed on standard time) is about 2025 PST, with twilight until nearly 2200 PST in June and July. Further north it's brighter, later. I've been in Yukon (63 degrees north) in May when it was like a bright overcast day at 0100. How much more do people want?
By the same token, our winters are dark, no matter what we do. The earliest sunset in Vancouver is about 1600 PST, and the latest sunrise is about 0800 PST.
I think messing with the clocks is pointless. There may be a sweet spot, say, around 40 degrees north, but Canada is well north of that.
...laura
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Not to mention the fact that the Central European Timezone runs from the Poland - Belarus border (~23 degrees east) to the western most tip of Spain (~9 degrees west), which is further west than Great Britain.
We had it somewhat solved prior to world war two. The Netherlands had its own GMT +00:20 timezone which went quite well with the fact that Amsterdam is about f
Better Yet (Score:2)
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Light at the end of the day is nice and all, but I find it much more difficult to make myself get up when it's dark..
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DST == Get Your Ass Out Of Bed Earlier (Score:3, Insightful)
Daylight Savings Time is just getting your ass out of bed earlier while pretending you're not. If you like to have light in the afternoon after you get out of work, go to work earlier and leave earlier. You're probably a techie like most of us, so you can probably work flexible hours like most of us. It's different if you're a factory assembly line worker and everybody has to be there at once for the line to roll, or a schoolteacher who's got to be there when class starts. (It's also different if you're
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The winter is terrible whatever we do with the clocks so I vote for keeping summer time all year round - because the summer is better for the extra hour of outdoor time in the evening. When you have slaved away for decades in an office you come to realize that this evening time is very valuable, I would even go so far as to say that double summer time GMT+2 would suit us in the UK with so called summer time GMT+1 for the winter. As for suicides and health problems - well stuff em I say, the gene pool could
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the summer is better for the extra hour of outdoor time in the evening.
Hate to break it to you; it's a number on a display. You're not getting an extra hour, you're getting a different number.
fix the rest of capitalism before you get excited about trivial things like DST.
As long as people actually appear to think that they magically get extra time because the numbers on the display say one thing I'm afraid fixing capitalism is out of reach. After all, if the boss turned the clock back eight hours I'd assume that people would just keep working at the end of the day...
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I don't think anyone actually thinks they get more free time.
What you do get though is light that lasts longer into the evening which is great for those of us who don't live near the equator (and by Scandinavian standards Italy and the continental US are pretty damn close to the equator).
Where I live the sunrise in mid-december is generally around 9:30-10:00 in the morning with sunset just after 14:00. In fact, with standard office hours we basically have sunset before 17:00 betweeen late october and earl
Aha...an argument against evolution... (Score:3)
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Well, for a large part of the year mornings here in Sweden are pitch black with normal time so from our point of view having DST all year round wouldn't make much of a difference there, we'd still be getting to work while it was pitch black for quite some time but at least when we got off from work in the afternoon there'd be a few less weeks when it would already be pitch black again.
As I stated, with normal time we have "sunrise" (beginning of dawn) around 9:30-10:00 in december with sunset (end of dusk a
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Do I smell Soylent Green here?
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In other words, people who are already in trouble feel compound effects with other changes in their lives.
Can an hour or two really have such a severe effect? If that was the case, shouldn't there be a massive effect when travelling and crossing time zones? A quick PubMed search didn't throw up any studies with jetlag and suicide or heart attack.
You're talking about results of a self-selected study, essentially. Most people who travel have a choice about when to do it, and don't do it when they're not up for it. Start involuntarily loading millions of people into airplanes with no regard whatsoever for their current health status and moving them to new time zones, then see what effect jetlag has on their health.
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