Cotton pillowcases create unnecessary friction, leading to frizz and breakage...

https://www.bravobookmarks.win/wake-up-with-less-frizz-by-tweaking-your-sleep-setup-cotton-causes-friction

Cotton pillowcases create unnecessary friction, leading to frizz and breakage while you sleep. Swapping to silk allows hair to glide, reducing damage. For extra protection, secure your hair in a loose braid or scrunchie