So I have a 2 1/2 year old Maine Coon mix. He is a very social and affectionate cat, but has a bitting problem. 99% of the time his attacks are towards my girlfriend. I've read the biting information thread which has really good info, but how do I train him not to bite while we are sleeping? He will bite her usually 3 times a night usually on her head, sometimes on the face and arms. What do we need to do?