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Axios Feb 6, 2017
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Why do we sleep? So the brain can forget

Why do we sleep? Is it to allow a weary mind to recover from a long day of making tens of thousands of decisions? Maybe. But two scientific teams working on different aspects of the question have come up with a startling, new answer. We sleep in order to forget some of what we learned during the day, they wrote in a pair of studies in Science.