6 Nighttime Habits That Make You Look Older

Why it's making you look older: Sleeping on your stomach or side can lead to wrinkles, says Lauren Ploch, MD, an Augusta, Georgia-based board-certified dermatologist and Fellow of the American Academy of Dermatology, which is why she and pretty much any dermatologist will tell you it's best to sleep on your back. If you're a stomach/side sleeper with cotton or flannel pillowcases though, you could be making matters even worse, as those two fabrics tend to cling and pull on the skin, says Rachel Nazarian, MD, assistant clinical professor of dermatology at Mount Sinai Hospital in New York.

The fix: Becoming a back sleeper isn't easy; plus, you can't control whether you move and turn over in your sleep. A do-able first move is to switch to silk or satin pillowcases.