Warning: your brain's in-box may be full of spam

"Busy people are familiar with the feeling that their heads fill up with a jumble of facts during the day, like an overstuffed inbox," says Stickgold, assistant professor of psychiatry at Harvard Medical School. "Such people often say, 'I need to sleep on it.' They do, and their heads feel less cluttered in the morning. Much of the excess detail is gone, and the important facts seem clearer."

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