I use an alarm app called Sleep Cycle, which basically monitors my movement and tries to wake me up at a good time. Similar idea to what you're showing, but a bit more dynamic (which could be good or bad, I suppose). Any thoughts on the two approaches?

For anyone who cares, I recommend Sleep Cycle most highly, or anything that gets you awake at a time more suited to your natural rhythm than an arbitrary alarm clock, whether Mr. Shaw's solution or something else. The difference really is remarkable, just as he says.