
Why Do We Have to Sleep
Season 3 Episode 48 | 7m 54s
and how did it evolve in the first place?
Why do we sleep? We spend a third of our lives in slumber, but science has yet to determine exactly why we have do it. Here’s a look at how sleep works, why we’re not getting enough sleep, what happens if you DON’T sleep, and an idea about where sleep came from in the first place.
Problems playing video? | Closed Captioning Feedback
Problems playing video? | Closed Captioning Feedback

Why Do We Have to Sleep
Season 3 Episode 48 | 7m 54s
Why do we sleep? We spend a third of our lives in slumber, but science has yet to determine exactly why we have do it. Here’s a look at how sleep works, why we’re not getting enough sleep, what happens if you DON’T sleep, and an idea about where sleep came from in the first place.
Problems playing video? | Closed Captioning Feedback
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