My wife's childhood cat was really old when she finally came to live with us in one of our rental places we lived while I was still doing grad studies. We used to close the door bc it was the one room with semi functioning AC, and during the summer we could kind of keep the room a decent temp if we kept the door closed. Anyway, the poor kitty would scratch the door and meow to be let in, and would not stop until we did (she would of course wait until we had fallen asleep first). Anyway, eventually we figured fans and an open widow were easier than being kept awake all night, so the door stayed open. That's when she started the fun new habit of 2am hairballs while sleeping between our heads...