Science of sleep quiz: How much do you know about sleep and dreams?
We invest a big part of our lives sleeping. That may look like an evolutionary drawback, offered sleep leaves us stable and possibly susceptible to attacks for hours on end–…
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Why do bats hang upside down to sleep?
By sleeping upside down, bats can more quickly prevent predators. (Image credit: Rapeepong Puttakumwong through Getty Images) When bats aren’t flying, they typically hang from cavern ceilings or the undersides…
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