My 7-month old neutered male cat cried outside our bedroom door all night, and this morning cries every time I go in the room. He and his twin are usually quiet except for in the mornings when they want their food

We did have an overnight guest sleep on our couch last night, where they usually sleep, so could that have upset or confused him? I am just concerned about this behavior because my husband's cat began crying for attention all the time after developing a tumor (she was 16 years old, though). I know it's just been one day of this, but I have never before had pets and am such a worrier when it comes to them.