If you’re waking up with tangled, frizzy hair, it’s usually down to friction....

https://charlie-wiki.win/index.php/How_Do_I_Keep_My_Hair_From_Tangling_If_I_Sleep_With_It_Loose%3F

If you’re waking up with tangled, frizzy hair, it’s usually down to friction. Standard cotton pillowcases tug at your strands, whereas silk allows hair to glide smoothly