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

https://highstylife.com/do-silk-accessories-actually-help-with-textured-hair-in-australia/

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