Waking up with a bird’s nest? That is just friction from your pillowcase...

https://wiki-zine.win/index.php/How_to_Protect_Chemically_Treated_Hair_Overnight:_A_Reality_Check

Waking up with a bird’s nest? That is just friction from your pillowcase causing those morning tangles and frizz. A silk case or a simple loose braid might sound like a small habit, but it really saves your hair overnight