Sleeping with your makeup on is one of the worst things you can do for your skin. At night, your skin is in recovery mode and works to refresh and regenerate itself while you sleep. If you leave makeup on, it sinks further into your pores, causing them to clog which may lead to breakouts. Not using a makeup remover at night may lead to your skin looking dull and prematurely ageing. Avoid the hassle and purchase a quality makeup remover to make sure your skin is clean and clear of makeup before you go to sleep.