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Russell Foster:
Why do we sleep?

TEDGlobal 2013 · 21:46 · Filmed Jun 2013
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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.

Circadian neuroscientist
Russell Foster studies sleep and its role in our lives, examining how our perception of light influences our sleep-wake rhythms. Full bio
This talk was presented at an official TED conference, and was featured by our editors on the home page.

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