"Beauty sleep?" Dream on! Sleeping doesn't relieve wrinkles on the face, say dermatologists, it causes them. Now, however, a Las Vegas plastic surgeon says she has found the solution: a new type of pillow.According to the American Academy of Dermatology, facial wrinkles can be divided into two types: expression wrinkles, which result from repeated contractions of the facial muscles (smiling, frowning, etc.) and sleep wrinkles, which are caused by the face repeatedly being mashed up against (and distorted by) one's pillow, during sleep.