If you wake up with knotted, frizzy hair, friction is likely the culprit....

https://wiki-velo.win/index.php/Is_Your_Cotton_Pillowcase_the_Secret_Culprit_Behind_Your_Dry_Scalp%3F

If you wake up with knotted, frizzy hair, friction is likely the culprit. Cotton pillowcases can snag delicate strands, unlike silk which lets hair glide