[xheavenlyx]

Retailing for about 10$ could be a vibrating clock. But with an extension of the vibrating feature which can be kept under the pillow or somewhere near.

Another idea is using a way to attach this 'Vibrator' to a normal clock. The vibrator can be the small mobile phone one's, maybe 3 or 5. Or a bigger vibrating motor (like the one used in PS2 controller).