Thats actually a cool idea, you could make some sort of an alarm clock program where the Wiimote makes a noise and vibrates like crazy, have the blue light of the Wii disc slot fade in and out, and if you keep your tv on, it could be black until the alarm is to go off at which point it would flash multiple colors.
Only real problem is, I don't know if there is anyway to make sure the Wiimote doesn't disconnect after little to no use for a long time.