Waking up with messy bed hair is normal, but constant friction against cotton...

https://wiki-cafe.win/index.php/Silk_vs_Satin_Pillowcase_for_Frizz:_Is_There_Really_a_Difference%3F

Waking up with messy bed hair is normal, but constant friction against cotton pillowcases can lead to breakage. Switching to silk helps, but the easiest fix is a simple, loose protective style like a braid. Your hair will be much healthier come morning!