zrinkill
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In what was the longest sleep-restriction study of its kind, Dinges and his lead author, Hans Van Dongen, assigned dozens of subjects to three different groups for their 2003 study: some slept four hours, others six hours and others, for the lucky control group, eight hours — for two weeks in the lab.
http://www.nytimes.com/2011/04/17/magazine/mag-17Sleep-t.html
http://www.nytimes.com/2011/04/17/magazine/mag-17Sleep-t.html