We spend a third of our lives asleep, but pillows can be the enemy. Cotton...

https://www.primary-bookmarks.win/waking-up-with-knotty-hair-usually-comes-down-to-friction-against-your

We spend a third of our lives asleep, but pillows can be the enemy. Cotton causes friction, leading to breakage and frizz. Try a silk pillowcase, or simply secure your hair in a loose, low plait before bed to minimise overnight damage