If you wake up with knotted, frizzy hair, friction is likely the culprit....

https://www.fastbookmarks.win/your-pillowcase-might-be-doing-more-damage-than-you-think-cotton-creates

If you wake up with knotted, frizzy hair, friction is likely the culprit. Cotton pillowcases can snag delicate strands, unlike silk which lets hair glide