Our old-man cat crying constantly during the night. Help?

You're kitty is getting a little senile in his old age. He's crying because when everyone is a sleep in bed, he's confused and doesn't know where you are. Try leaving some lights on in the house and the TV on downstairs. Or maybe confine him to just one room where he can spend the night without wandering around the house looking for you. The TV and lights tends to do the trick though.