"My cat sleeps ALL DAY and then wants to prowl around at night, run around the apartment meowing, scratching, etc. One of us would wind up waking up at 3am screaming at him to shut up. Then he goes back to sleep when we are all up in the morning, groggy and grouchy. We tried to keep him up during the day and tire him out but it would only work for a couple of hours at night.
Now we use Good Cat!. I saw the great reviews for it here and bought it out of desperation. It's odorless and tasteless, all natural. I add a capful to his water. It worked great. He was calm and quiet all night. Then we forgot to give it to him for a while, and he started up again with the constant running and meowing at night. We started giving it to him again and he's been calm and quiet and night. He'll probably start up at like 5:30am or 6am, which is fine since we all wake up soon after that.
This is a miracle."