Pillowcases.

"I use Lily Silk pillowcases and they're nice. But whenever you do a pillowcase in silk you pay more, but if you're a side sleeper like myself, totally worth it because when I wake up with a regular pillowcase those sleep wrinkles are real. We've seen it published in plastic surgery journals that these sleep wrinkles over time when you have frictional rubbing and pressure on your face you can get static wrinkles or reds that don't go away, permanent wrinkles from laying on your side for so long and so consistently. They lead to wrinkles that just stay there, not just right after you wake up but throughout the day. A silk pillowcase can help relieve the tension and pressure on your face so you wake up refreshed and without those sleep wrinkles."