CARROT Alarm, by the makers of CARROT to-do, brings the same charm to getting you up out of bed in the morning as they did to getting stuff done. And yes, that means the artificial personality wrapped around the app that will sarcastically, acerbically, almost priggishly bully, cajole, and threaten you into setting alarms, and then make it you jump through tap, flip, and shake hoops to turn it off again.
There's quite a bit more to it than that, of course, and you can find out all about it on the CARROT website.
The short version: You'll hate it. You'll love it. You'll wake up.