While you sleep, your body temperature goes up, causing you to sweat and release moisture, which dries out the skin. This is especially true in the winter months, when you have cold, dry air outside and the heat on inside.
"To keep your skin hydrated, apply a thin layer of moisturizer that contains humectants like hyaluronic acid or glycerin, which bind water to the skin, as well as ceramides that will restore the lipid barrier," says Diane Berson, M.D., assistant professor of dermatology at the Weill Cornell Medical College of Cornell University. Clinique Moisture Surge, $34, packs potent hydrators into a non-greasy formula that'll help you stay supple while you sleep. You may also want to try a humidifier at night to replenish the moisture in the air.
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