The Zeo personal sleep manager monitors your brain wave patterns using a headband. You can also move data from your Zeo to your computer using an SD memory card (like those used in digital cameras) out of the headband and put it in your computer and get a view a graph of your light, deep and REM sleep over the course of the night.
The optional SmartWake alarm feature will look for a “natural awakening point” based on your sleep patterns to decrease the grogginess associated with waking from Deep sleep. When SmartWake is selected, Zeo will find a time to wake you within a half-hour of your set time, never later. The result should be a slightly easier way to wake up.