Help. Does anyone have any suggestions on how to get my 7 month old neutered cat to sleep all night? He is becoming nocturnal and is driving us crazy. He used to sleep all night and for about a month now, he wakes up at 3:00 AM and won't go back to sleep until about 5:00 which is when the alarm clock goes off. We have tired cat nip and that hasn't helped. We can't close the bedroom door because he will cry until we open it up or he jumps at the door and makes a lot of noise. Any suggestions?