I guess the first thing experts here recommend is to check your pet (in this case, BOTH cats) to see if the vet finds something physically wrong with them (urinary tract infection or others).
Also, you could try isolate them at night, in different rooms, with their own food, water, litterbox and toys. You may find out who has the problem.
Also, maybe they are just 'protesting' for being enclosed at night, but since I assume you've done this for a while, they should be acustomed by now.
Good luck with your kitties. GLOW
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Bob, Daisy, Karla and the Goldfish

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