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

https://kilo-wiki.win/index.php/Protect_Your_Investment:_The_Ultimate_Guide_to_Bedtime_Hair_Care_for_Short_Styles

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