When I was working days when I first got Remus he woke me up precicely 10 minutes before my alarm went off. Even on the weekends he figured I just HAD to be up at 6am watching him go through cat crazies at first by himself and later with Spook Once I started working at night I would either just be getting home or going to bed when the cat crazies started up and I figured out it wasn't so much him waking me up as it is he just likes to go nuts right around 6. He even does it here lol.
If I forget to fill the water dish or the food dish before I go to bed though he wakes me up JUST as I get to sleep. He can't remind me before I lay down oh no, he has to wait for at least an hour or two lol. I think the other cats use him as an ambasidor as he is never first to the dish when I DO get up and fill it but he is the only one that even attempts to wake me up. I think they all know that Remus is very good at his job