Constant friction against cotton is a quiet hair-wrecker. If you wake up with...

https://theaustralianpost.com.au/protecting-hair-while-sleeping/

Constant friction against cotton is a quiet hair-wrecker. If you wake up with frizzy, tangled lengths, swap to a silk pillowcase to minimise drag. For extra protection, secure your hair in a loose braid or bun before hitting the hay