Smoother, firmer skin with fewer signs of aging

“The deeper layers of your skin are working at night to build new collagen, which makes your complexion smooth, and firm,” Dr. Bowe explains. Pro tip: Keep wrinkles at bay by sleeping on your back rather than on your side or facedown, suggests Jesleen Ahluwalia, M.D., a New York dermatologist. “Repeated pressure on the skin that causes creases can lead to set-in lines over time,” she adds.