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NOVA — S47E4
Episode: Mysteries of Sleep
Air Date: 2020-02-26
Runtime: 55 min
Overview
From fruit flies to whales, virtually every animal sleeps. But why? Why do we need to spend nearly a third of our lives in such a defenseless state? Scientists are peering more deeply into the sleeping brain than ever before, discovering just how powerful sleep can be, playing a role in everything from memory retention and emotional regulation to removing waste from our brains.