Stop wake-up frizz by reducing night-time friction. Standard cotton pillowcases...

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

Stop wake-up frizz by reducing night-time friction. Standard cotton pillowcases can be rough, causing breakage. Swap to silk or secure your hair in a loose, comfortable braid before bed. It’s a simple, practical way to maintain hair health while you sleep