To figure out what exactly is going wrong (and how to make it right), we talked to Manhattan Dermatology and Cosmetic Surgery’s Dr. Monica Schadlow and aesthetician Andrea DeSimone. Their expert intel revealed the habits that can deplete skin’s moisture, the foods that can help restore it, and the secret weapons that can work wonders (like Olay Regenerist Luminous Overnight Mask — a multitasker's dream). Eating and sleeping our way to better skin? Sign us up.