Waking up with frizz is often down to friction. Cotton can be drying, whereas...

https://cruzinnp079.tearosediner.net/what-should-i-do-tonight-to-wake-up-with-less-frizz-tomorrow

Waking up with frizz is often down to friction. Cotton can be drying, whereas silk helps hair glide. For better protection, loosely tie your hair in a soft scrunchie before bed