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Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate …and how did it evolve in the first place? Tweet ⇒ http://bit.ly/OKTBSsleep Share on FB ⇒ http://bit.ly/OKTBSsleepFB ↓ More info and sources below ↓ Why do we sleep? We spend a third of our lives in slumber, but ...
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