Sleep is good for your skin. Concretely.
Collagen
During sleep your body produces collagen, the protein that keeps your skin firm and elastic. Whoever sleeps at least 6 hours gives the skin the chance to produce collagen. 5 hours or less: drier skin, less collagen, deeper wrinkles.
Circulation
During sleep your body sends extra blood to your face. Toxins are removed, nutrients replenished. The result: a natural glow that no cosmetic product fully imitates.
Cell renewal
Every 4 to 6 weeks the epidermis renews itself. Your skin needs at least 4 hours of rest a night to complete that process.
Recovery
After a day of air pollution, wind and cold, sleep restores your skin's barrier function. The night does more for your skin than any serum.