I wake up all the time wondering why I feel great one day and like crap the next. Tanita Sleep Scan SL-501 is a mat that you place on your bed and underneath your sheets. Using a set of microphones it records and detects your body motion, heart rate and breathing patterns to an SD card. The data can then be downloaded to a PC and your sleeping patterns will displayed in an easy to use graph telling you when you woke up, how long you were asleep and more.
At $576 I’d just as soon opt for the Zio sleep system, which monitors your brain waves and costs far less.