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

https://messiahwmff829.lucialpiazzale.com/what-should-i-do-if-a-bonnet-keeps-slipping-off-at-night

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