Why Do Humans Need to Sleep and Animals Too?

Discover the mystery of why humans and animals need to sleep for one third of their lives, or even more. See details of the four theories proposed

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Animals need sleep as well - Image 1 | Cat sleeping, Cats, Funny animal quotes

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Discover the mystery of why humans and animals need to sleep for one third of their lives, or even more. See details of the four theories proposed

4k followers

Comments are turned off for this Pin