Just out of curiosity do you cats have particular room in which they sleep or to you give them free run of the house at night? My boyfriends cats have a proper cat bed upstairs on the landing but they also have the choice of the kitchen or conservatory. My cats, Frank has his own cushion in the kitchen and he stays in there all night, Max sleeps in my bed which of course is fine for him but is not so good for me cos he is like a little radiator, he is so hot, but i can't throw him out. Plus its more his bed than my bed now as i'm away at uni most of the year.