Tango Bango

"The WakeMate wristband collects data throughout the night and stores it on internal Flash storage. When it’s time to wake you up WakeMate doesn’t necessarily sound an alarm at exactly the time you set. Instead, it monitors your sleep patterns for the 20 minute window prior to that and sounds your alarm when you’re in the lightest sleep mode, which can help eliminate that groggy feeling you sometimes wake up with."