Why We Sleep

#Science

Tue, Aug 20th, 2013 10:00 by capnasty NEWS

On TED, Russel Foster gives a fascinating talk on why we sleep and explains all we currently know about its purpose.

Russell Foster is a circadian neuroscientist: He studies the sleep cycles of the brain. And he 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 -- and hints at some bold new uses of sleep as a predictor of mental health.

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