You can avoid sleep wrinkles by sleeping on your back or by sleeping on a satin pillowcase! Night time wrinkles are caused by the friction of rubbing your face, all night long, against your pillow. A satin pillow case will let your face ‘slide’ instead of ‘rubbing’ on the pillow case and your face will definitely look the better for it in the morning. There are also special sleep wrinkle pillows that you can buy that will hold your head in a certain position to alleviate those sleep wrinkles!