The WakeMate is a smart wrist band that monitors your sleep and gives you a gentle nudge to wake up. Unlike normal alarm clocks which just blast you into consciousness the WakeMate is supposed to leave you bright and refreshed when you wake up. It even works with naps. You program the WakeMate to wake you within a 20 minute window and it will find the right spot. It works with all bluetooth phones apparently and it’s not available just yet but it will be US$49.99.
The WakeMate uses a science called actigraphy to analyze your sleep. Actigraphy uses an actigraph (the WakeMate unit) placed on a subject’s wrist to monitor the motion. The motion data is then analyzed to determine sleep patterns and circadian rhythms of the subject. For more information, you can download a paper on actigraphy here.