Eli5: Why do we need to sleep so much, what happens in the body when asleep that cannot happen while normal resting or relaxing? Or is it just for the brain?
In: Biology
As pointed out by others: we don’t really know. But think about it: for a prehistoric animal it is really weird to just lie on the ground helpless for several hours when predators could munch you up any time. The payoff has to be immense to justify such a big risk.
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