We’ve all done it—coming home exhausted and skipping makeup removal “just this once.” But the truth is simple: “One night of sleeping in your makeup can undo hours of skincare work and lead to long-term damage.” Dermatologists and eye doctors agree that this habit harms both skin and vision, even if it feels harmless in the moment.

When makeup stays on overnight, it mixes with oil, dirt, and bacteria, settling into pores and triggering blackheads, pimples, and irritation. It also interferes with the skin’s nighttime repair, leading to dryness, dullness, and early aging. As experts explain, “Sleeping in your makeup can disrupt the skin barrier and increase the risk of irritation and infection,” says Dr. Marisa Garshick.

Eyes are especially vulnerable. Mascara and eyeliner left on overnight encourage bacterial buildup that can cause styes or pink eye. Ophthalmologists warn, “Mascara left on overnight can flake into the eyes, causing redness, swelling, and even scratches on the cornea.” Makeup near the lash line can also clog oil glands, worsening dry eye and eyelid inflammation.

Makeup creates a barrier that traps oil, pollutants, and dead skin cells, turning skin into a breeding ground for breakouts. It also blocks skincare products from absorbing properly, meaning serums and moisturizers “go to waste” when applied over makeup.

The fix is simple: remove makeup every night. Use a gentle remover, cleanse again, then moisturize. Even sunscreen should come off before bed. Skipping this step can lead to acne, premature aging, eye infections, and a dull complexion—proof that a few extra minutes now can save weeks of skin trouble later.