My bfs cat eat my hair at night

A • Sold my soul for pizza rolls.

Does anybody here know anything about cats? Because my long term boyfriends cat eats my hair at night. When we go to bed kimba (the cat) will lay either on his pillow or mine but whenever he lays on my pillow he’ll start to lick & chew my hair, I cant figure out why but I’m very curious if there could be a actual reason why he’s doing this