Waking up

All of us at some point in time have had problems waking up in the morning. Lack of sleep, will or whatever, I have always been astonished by the lack of offerings in terms of intelligent waking mechanisms. I mean, a simple buzzer just doesn't do it. There are very few alarm clocks with two settings and I know of no alarm clocks with an intelligent way of waking people up. One could think of building an alarm clock that fits ones sleeping patterns and waking patterns. Some type of algorithm using a bayesian approach may be the answer.