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.
TEDTalks is a daily video podcast of the best talks and performances
from the TED Conference, where the world's leading thinkers and doers
give the talk of their lives in 18 minutes (or less). Look for talks on
Technology, Entertainment and Design -- plus science, business, global
issues, the arts and much more.
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