I got my kitten when she was 7 weeks and ive had her for a month now, she has slept with me every night since I got her and she bites me all the time out of nowhere a lot of times it seems like she's just trying to play but lately she will run up to me while I'm laying in bed and start biting my face while purring and then runs away again. She never draws blood or put a ton of pressure on her bites but when she nips my cheek and nose it hurts. Why does she do this? And how can I can get her to stop the random nipping?