I just adopted two 2yr. old cats from the shelter and despite attacking my feet they are very affectionate. Last night my husband and I let them into our bedroom for the first time while we were going to bed. As we moved our legs under the sheets our cats starting biting our feet, I'm sure not knowing we're attached to them, as if they were hunting mice. They don't normally do this when we're not in bed. I would prefer to let them into our bedroom at night since it's the warmest room in the house but I worry that they might hurt us. How do I get our cats to understand that those are our feet under the sheets?