8 years ago
What is the real reason we sleep?
It is surprisingly hard to pin down why we snooze, partly because sleep does so many good things that we can't tell which is the crucial one. There are a few things we literally cannot live without. Oxygen is one. Another is food and water. And then there is sleep: forcibly keep an animal awake for long enough and you will kill it. The same almost certainly applies to humans.
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