I have two cats. One is almost seven (Asher) and the other is almost three (Jack). Asher seems to have developed a new and very annoying habit. Almost every night around 3 or 4 AM he begins persistently meowing. If the bedroom door is closed he will sit outside the door and meow. If it's open he will come into the room and meow. It is very annoying and wakes me up. Nothing has changed around the house so I can't figure out what the deal is? Anyone have any suggestions?