The New York Times has a good story on how sleep is increasingly becoming a big business -- and the tech industry is rushing in to tweak our natural rhythms. From the article: At M.I.T.'s Media Lab, the digital futurist playground, David Rose is investigating swaddling, bedtime stories and hammocks, as well as lavender oil and cocoons. [...] Meanwhile, at the University of California, Berkeley, Matthew P. Walker, a professor of neuroscience and psychology and the director of the Sleep and Neuroimaging Laboratory there, is working on direct current stimulation as a cure for sleeplessness in the aging brain. [...] In Paris, Hugo Mercier, a computer science engineer, has invested in sound waves. He has raised over $10 million to create a headband that uses them to induce sleep. [...] Ben Olsen, an Australian entrepreneur, hopes to introduce Thim, a gadget you wear on your finger that uses sound to startle you awake every three minutes for an hour, just before you go to sleep. [...] Sleep entrepreneurs from Silicon Valley and beyond have poured into the sleep space, as branders like to say -- a $32 billion market in 2012 -- formerly inhabited by old-style mattress and pharmaceutical companies.