Sleep Time is an alarm clock (for iPhone only) that wakes you up when you're sleeping lightly--so you feel more alert and refreshed!
Set the alarm on the "Alarm" screen by dragging the red "Set" scrubber along the circumference of the clock. As you drag, a digital read of your alarm time will show up on the clock.
Once you've set the time you want, press "Start". Then you'll need to place your phone face-down on the corner of your mattress.
Remember: NEVER press your phone's Lock or Home button. That would send Sleep Time to the background and it will not collect sleep data. Just place the phone face-down on the bed after pressing Start and the screen will dim automatically.
When your alarm goes off in the morning, press and hold the Alarm Off button for two seconds to turn off the alarm.