Sleeping in your makeup.
Yes, you know that this is bad. After all, it's probably why the beauty industry invented cleansing wipes! But it doesn't just cause breakouts — falling asleep with a dirty face can make you look older sooner. Makeup settles in your pores and stretches them out, which is permanent over time. Enlarged pores = rough, aged skin. Trust us, if we knew all along that a clean face was the key to keeping our skin dewy and youthful, we would have created better habits long ago.