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Skimping on sleep

Getting insufficient shut-eye can age skin prematurely—and, in the short run, result in dark circles and a lackluster complexion. During the day, our skin cells are battling against an onslaught of stressors, like UV rays and pollution. Sleep is vital because stress hormones drop to normal levels at night, giving cells time to repair and rejuvenate, says Dr. Jacob.

Plus, stress raises the levels of the hormone cortisol, which increases oil production and can lead to bouts of acne, according to Dr. Jacob. So make sure you’re not depriving yourself of the sleep you need.