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

https://theaustralianpost.com.au/protecting-hair-while-sleeping/

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.