Alarm problem

Why does the alarm work if the sleep is already over and the wristband is on the dresser?
How is a smart alarm clock supposed to work? Should it wake you up in the lightest phase of sleep, or is this another flaw? It always wakes you up at the last possible moment.

  • I've been using the Smart Alarm with my F8 in beta before I got the ISM and the moment I was awake before the latest alarm time, it would gently vibrate (not as strong as the typical alarm).

    Having worn my ISM for more than a week and most of thime being awake before the alarm, I haven't felt once a single vibration on my arm.