Sleep

When you don't get enough sleep, the body produces excess cortisol, a hormone that breaks down skin cells, says Nicholas Perricone, MD, dermatologist at Yale University. When you do get enough sleep, your body produces HGH (Human Growth Hormone), which helps keeps your skin thick and healthy. Not only do you need enough sleep, but the way you sleep matters, too! If you sleep on your side or face-down, you may get sleep lines, which after a while don't go away when you wake up. This is a very faint and long process, so simply try not to sleep on the same side every night. The best position to sleep is on your back.

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