Waking up with a bird’s nest is a total drag, but it doesn’t have to be....

https://web-wiki.win/index.php/Is_Sleeping_With_Your_Hair_Tied_Up_Actually_Causing_Breakage%3F_(And_How_to_Fix_It)

Waking up with a bird’s nest is a total drag, but it doesn’t have to be. Overnight friction is the silent enemy of smooth hair. A few simple tweaks—like using a silk pillowcase—stop those morning tangles and frizz before they even start.