Did you know that sleeping on your back is good for your skin? Gravity pulls on your skin during the day, which can make you look tired. At night, while you sleep, you want to reverse what gravity does to your skin during the day. When you sleep on your back, you counteract that pull. When you sleep face down, fluid pools in your face, adding to the adverse affects of gravity pulling on your skin all day. So you may awaken with an abundance of puffiness because of the excess fluid in your face. Do the skin on your face a favor and sleep on your back.