09/07/2014 12:52 pm ET

5 Possible Explanations For Why We Need Sleep


Most of us are programmed to spend roughly one-third of our lives sleeping (save for the few who are wired to go with less). But why? What's the point of all this slumber?

For decades, scientists have been trying to figure out why, exactly, humans need to sleep so much. And after all this time, no one knows for sure. But there have been a variety of interesting hypotheses proposed.

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