We have a queen sized bed, and one of our cats sleep there, along with our two yorkies! They snuggle with us, keeping us very warm. I have done that since I first got them, and they never had an accident on the bed. They always hold it all nite, always have, since tiny 8 wks old! If it's cold in the house, they go under the covers. We have never slept on them or hurt them. You know where they are and they know where you are. I get up a couple of times during the nite, too, and it always works out fine!