I don’t think there’s anything as annoying as being jolted awake by a high-pitch electronic sound in the morning. Here is an alternate solution that ought to be more pleasant on the ears:

“Silence” is a conceptual alarm clock that will wake you up without emitting any sound. Each person who wishes to get woken by it has to wear a special wireless rubber ring. When the designated wake-up time comes, the clock will send a signal to the ring, which in turn will generate a tactile alarm. The sleeper can then shake his hand to activate the snooze function if he wishes to sleep a bit longer. However, further snoozes will be harder to generate, requiring more vigorous shaking each time.

[Via Yanko Design]