NOVA

Mysteries of Sleep

Passport Season 47 Episode 4 | 53m 14s Video has closed captioning.

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.

Aired: 02/26/20

Expires: 02/10/23

Rating: TV-G

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