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  • NOVA

    Mysteries of Sleep

    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

    Expired: 03/25/20

    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 <a href="http://www.draper.com/" target=_blank">Draper</a>. Major funding for ...

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