At night, both cats, the upstairs cat and the downstairs cat, are shut in the kitchen. We have a slight problem at the moment; the upstairs cat has taken to sleeping on the breadboard because the downstairs cat won't let it have the vegetable rack.
They used to have bunk-beds in the vegetable rack, which worked quite well, apart from fights over who got to sleep in the top bunk.
Then one night, the whole arrangement collapsed, literally, and neither cat was prepared to sleep in the bottom bunk.
We have taken steps to ensure that breadboard is no longer available as a place of comfort and repose. Besides, she has a perfectly good washing-up-bowl to sleep in.