You spend good money at the salon, so why undo it all while you sleep? Cotton...

https://www.female.com.au/why-more-australian-women-are-rethinking-their-night-time-hair-care-routine.htm

You spend good money at the salon, so why undo it all while you sleep? Cotton pillowcases cause constant friction, leading to frizz and those annoying morning tangles that snap your ends