Our Feline kids do just that!!! I was always on schedule work hours and had the cats waiting in the windowsills for me to show up. Now that I don't work except for me and Jill the cats line up at 5:10PM for her to arrive at 5:15PMThe day a cat almost sh!ts herself every day when I get home from work because she's so happy to see me, or hobbles her 14 year old arthritic arse into the living room on a cold winter morning so she can sit at my feet is the day I'll consider owning one.
We also have a few the will wake us up right before our regular alarm go off.