Haha, I know the feeling. And if you have long hair, waking up with it all knotted up with kitty slobber in it is really no fun. I really don't know of a way you could break her from this behavior either. If it bothers your gf, then maybe she could try spraying her hair at night with some of that sour apple spray. I am not sure if this would be any better then having a cat in your hair though, I am sure that stuff can be sticky. Cat's don't like it though and you might find that if she does this for a few nights, your kitten will learn that hair is not a good toy!