Our mothers have told us time and time again. At least I know mine has. "Make sure you wash your face before going to bed" was (and still is) the voice I always hear in my head before jumping into bed. And she was right! It turns out that sleeping in your favourite (and expensive) makeup can do some serious damage to your skin. Who knew? According to Dermatologist Jeannette Graf, MD, assistant clinical professor of dermatology at Mount Sinai Medical Center, NY "At night