Ever wonder why you wake up with a bird's-nest? It is all down to friction....

https://www.female.com.au/why-more-australian-women-are-rethinking-their-night-time-hair-care-routine.htm

Ever wonder why you wake up with a bird's-nest? It is all down to friction. Tossing and turning on standard pillows roughs up the hair cuticle, leading to frizz and those stubborn morning tangles