Emily, my first cat, learned that she could open the medicine chest in the bathroom, and either bat it open and closed to make noise or bat items from it into the sink, making a different sort of noise. All this was in aid of getting me out of bed so I would feed her, because she got fed in the morning.

Ever since then, every cat in my house has been fed in the afternoon, after work. I'd much rather have a cat reminding me that it's the end of the work day than that it's time to get up. Especially when the cat's idea of when it's time to get up doesn't accord with mine.