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

https://www.paste-bookmarks.win/ever-wake-up-with-a-bird-s-nest-it-s-usually-down-to-friction-standard-cotton-1

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