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In case you didn't hate cortisol enough, the hormone can also cause your skin cells to deteriorate faster. Guess the saying "stress ages you" is true! Getting a good night's sleep is paramount in the cell-renewal process.

Nighttime is when your skin repairs itself, making it the ideal time of day to apply antiaging treatments like retinol. Also during REM (the middle hours of sleep), melatonin is released, which acts as a natural antioxidant. Pull up a satin pillowcase, and catch some z's for younger-looking skin.

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