While overnight masks are intended to be worn for several hours while sleeping, they should be removed as you wake up. "Overnight masks should always be rinsed off in the morning," Dr. Imahiyerobo-Ip recommends. "Leaving them on may increase the likelihood of unintentional breakouts." Washing them off before putting them back on again will also help prevent spreading germs from one face to another. Overnight masks are different than daily use masks because they're designed to fit over your whole face instead of just covering your eyes. This allows moisture to dry under the mask so you don't feel like you need to rinse it off every time you wake up. However, we do recommend washing them after each use just to ensure that you're not spreading any germs around your home.