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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Problems Playing Video? | Closed Captioning

Additional funding is provided by the NOVA Science Trust with support from Margaret and Will Hearst. National corporate funding for NOVA is provided by Draper. Major funding for NOVA is …

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