Man I love this idea. Basically, it's a wrist watch that measures how you sleep, which you can then download to a computer. I've always wondered what I look like/move like. But the best part about it is that it'll wake you up depending on what phase of sleep you're in. For example, you set the wake time to 6:30 and a wake interval of 30 minutes. It'll then wake you around that time... maybe earlier, maybe later, depending on your phase of sleep. It measures this based on how much you're moving.I think this is brilliant and I'm totally going to get one... eventually.Sleep TrackerD