My cat's always welcome in my bed, but since we got the puppy, his visits are shorter. Another thing is in summer when we have the window air conditioner in, he seems to prefer sleeping in the living room. When we go camping, he sleeps with us all the time, almost always on my side near or on my pillow. On camp trips the dog stays on the lower "dog bed", he doesn't share our sleeping area.
Does your cat(s) sleep with you? Does he stay the full night, or just temporarily?