What is a "motion-sensitive sleep alarm"? One of those widgets that wakes you up at the most advantageous part of your sleep cycle that falls within a given bracket of time? ISTR seeing one of those a while back, in production, which was built on the wristwatch form factor and didn't need to integrate with an external device; if indeed that's what you're looking for, I'll see if I can turn it up and post info about it here.