eli5: Why do we sleep better when lying down?

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eli5: Why do we sleep better when lying down?

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To sleep properly, all of your muscles must be relaxed. When a human relaxes all of their muscles, laying down is pretty much the result.

Animals that can sleep standing, like horses, have a locking – or fixing – mechanism, that allow them to relax their muscles while standing. As stated in the first response – people don’t.