My adopted 8 Yr old tortie is a very sweet cat. When she's on her playing mode, I'll just put my hand near her and touch her. At first she will light bite my hand but once she realises its my hand, she will immediately lick it. I don't know why but every morning she will bite me when I did not wake up and feed her. This one I could understand but sometimes at some random timing of the day, she will just go to my bed and treat me like enemy and kept biting me regardless feet or hands.. As I'm writing this I had scratches on my hands, not serious, but she really bites hard.. Now I feel like it's getting more and more frequent and I do not want her to get into the habit of biting.. what should be done?