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Sleep - wikipedia, Sleep may be an actively social time, depending on the sleep groupings, with no constraints on noise or activity. people sleep in a variety of locations..

National sleep foundation - sleep research & education, Explore the national sleep foundation, your source for sleep research and education from sleep disorders and problems to polls and maximizing energy..
The russian sleep experiment - creepypasta wiki, Russian researchers in the late 1940s kept five people awake for fifteen days using an experimental gas based stimulant. they were kept in a sealed environment to carefully monitor their oxygen intake so the gas didn't kill them, since it was toxic in high concentrations..
How sleep ? - national sleep foundation, Ever wondered how much sleep you really need? the national sleep foundation has done extensive research and found out exactly how much you need at every age. learn more..