Bad news, stomach sleepers: Sleeping with your face pushed into your pillow can cause your extensions to fall out more quickly. Instead, try to sleep on your back for ultimate eyelash extension maintenance. What’s more, be sure to do so using a silk pillowcase so if you do roll over, your lashes will be pampered and less likely to get snagged out. We’ve all heard how a silk pillowcase can help reduce frizzy hair and face wrinkles, and guess what? Now we can add lash extension preservation to the list of benefits. “Cotton [pillowcases] can cause drying and snagging,” says celebrity lash expert, salon owner, and Envious Lashes brand founder Clementina Richardson, which will lead to premature loss of precious lashes.