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Michael Roizen, MD, Internal Medicine, answeredAll exercise helps you sleep as long as it's done three hours before bedtime. But brain scans show that fitting in fitness around 7 a.m. helps you spend 75% more time in deep sleep than later-day workouts do -- and you cycle through the stages of sleep more often. Hitting all four sleep stages several times keeps your energy high, your mind sharp and your body looking good.Helpful? 1 person found this helpful.