Sleep and exercise go hand-in-hand. A good night of sleep can help you crush your workout the next day, and that good workout can, in turn, help you drift off and sleep better the next night. Sounds pretty ideal. But it can also go the other way, with research showing that a poor night of sleep has an adverse effect on your workouts (and a whole lot of other things).

"It's not whether exercise is good or bad for your sleep," said Rafael Pelayo, MD, a professor of psychiatry and behavioral sciences at the Stanford Sleep Medicine Center. "I think everybody would agree that exercising is good for you. With sleep, it's more about the timing of the exercise." That is, exercise can help you sleep better, but it depends on when during the day you're getting your workout in. Some timeframes can improve your sleep; others, potentially, could do the opposite.

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