Cotton pillowcases create friction, leading to morning frizz and breakage....

https://blogfreely.net/sordusgvrj/how-to-protect-your-hairline-and-edges-while-sleeping-a-pros-guide

Cotton pillowcases create friction, leading to morning frizz and breakage. Switching to silk is a simple fix, but if you’re not ready to swap your bedding, try a loose, soft scrunchie braid