Waking up to a bird-nest? It is usually just friction from your pillowcase...

https://highstylife.com/what-are-gentle-hair-ties-that-do-not-pull-at-night-and-why-your-current-one-is-probably-wrecking-your-ends/

Waking up to a bird-nest? It is usually just friction from your pillowcase causing unnecessary frizz and tangles. A silk pillowcase or soft hair-wrap is a total game-changer