Numerous studies show that sleep deprivation causes elevated levels of ghrelin, the hunger hormone, which can lead you to overeat. But it's not just your waistline you need to worry about. A study published this spring found that regularly getting less than six hours of sleep can double a person's risk for heart attack and stroke.
Establish a relaxing pre-bedtime routine that doesn't involve a computer or TV. The blue-hued light from their screens has been shown to throw off the body's natural circadian rhythm, keeping you alert into the night.