Waking up with bedhead? Cotton pillowcases cause friction that leads to...

https://bizzmarkblog.com/do-i-need-silk-to-reduce-frizz-or-can-i-just-change-my-habits/

Waking up with bedhead? Cotton pillowcases cause friction that leads to breakage. Switching to silk helps, but try securing your hair in a loose, low bun before bed. It’s a simple habit that keeps your strands smooth and minimises damage while you sleep.