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We've Had First Sleep, But What About Second Sleep?
A Siesta for the Rest of Us
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Key Facts In This Video
There is no solid scientific consensus on why we sleep. 01:56
Black rhinos sleep for one to two hours laying down, and three to four hours standing up. 04:23
Dolphins engage in unihemispheric sleep, which means that one half of the brain is resting while the other half is alert. 08:01
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