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

https://wiki-club.win/index.php/How_to_Reduce_Mechanical_Stress_on_Your_Hair_at_Night:_The_Secret_to_Stronger_Strands

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