Sleeping Beauties: How Hollywood Gets Gorgeous at Night

From Heidi Klum's tip for sexy hair to Kim Kardashian's trick, stars and their glam squads share their favorite tricks to getting gorgeous – during sleep. By Katherine Kluznik Rentmeester.

SLEEPING SERUM

Nighttime is the right time to apply your favorite serums, according to Dr. Fredric Brandt, whose celeb fans include Kelly Ripa and Stephanie Seymour. "While sleeping, the body repairs itself by stimulating cell turnover and renewing skin cells that have encountered the damaging effects of sun, pollution and other environmental stressors," he says. "Growth hormones are also released during this period of time while the body is at rest, making this the best time to stimulate collagen production with topical treatments for an even, luminous and youthful complexion." Make the most of your beauty sleep with Dr. Brandt's cult-favorite, Lineless Anti-Glycation Serum ($90).