Wake up with less frizz by minimising overnight friction. Cotton pillowcases...

https://station-wiki.win/index.php/Silk_Pillowcase_vs._Satin_Pillowcase_for_Frizz:_Is_There_Actually_a_Difference%3F

Wake up with less frizz by minimising overnight friction. Cotton pillowcases are often rough on hair; switching to silk helps retain moisture. For extra protection, secure your hair in a loose, comfortable style before bed to keep it smooth until morning.