Waking up with frizzy hair is often just friction from cotton pillowcases....

https://www.adirs-bookmarks.win/if-you-wake-up-with-knotty-frizzy-hair-your-pillowcase-might-be-the-culprit

Waking up with frizzy hair is often just friction from cotton pillowcases. Switching to silk helps prevent snagging and keeps hair hydrated overnight. For a simple morning win, try a loose protective style like a soft braid