Bought one today after seeing this thread to make a sleep analysis device and webapp. I am a sleep scientist and I would love to have data of sleep patterns of thousands of people. For accurate yet longer analysis we normally use a commercial product called actiwatch but, as everything in research, is very expensive ( <a href="http://tinyurl.com/yhowa64" rel="nofollow">http://tinyurl.com/yhowa64</a> ).