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You�d think that more hours awake means more opportunities to sizzle calories, but the truth is that more sleep makes for a quicker metab. In fact, a single sleepless night reduces your resting metabolic rate by about 5% several hours into the next day, according to a study in the American Journal of Clinical Nutrition. What�s more, the morning after skipping sleep you burn 20% fewer calories from diet-induced thermogenesis�the number of calories your body uses to break down and digest food. As if that wasn�t enough to encourage you to power down your iPad early, scientists have found that women consume 329 more calories, on average, after snoozing for four hours than they do when they sleep for nine. To keep your cravings in check while preventing your engine from sputtering, try to get seven to eight hours of sleep per night.