FILMED JUN 2013 • POSTED AUG 2013 • TEDGlobal 2013
TED presents Russell Foster who is a circadian neuroscientist: He studies the sleep cycles of the brain, and asks: What do we know about sleep? Not a lot, it turns out, for something we do with one-third of our lives. In this talk, Foster shares three popular theories about why we sleep, busts some myths about how much sleep we need at different ages.
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