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A Dream Is A Wish Your Brain Makes
Dream On, Pal
Why Do We Sleep?
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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