Wake at Your Perfect Time

The Key to Waking Up Refreshed

Why is it so hard to wake up to a normal alarm clock? Because a normal alarm clock can't detect where you are in your sleep cycle - a continuous cycle from deep sleep, to brief almost-awake moments, and back to deep sleep again. Occasionally, your alarm may catch you at an optimal, almost-awake moment and you wake up feeling refreshed, but usually you grope for the snooze button waking up tired and groggy.

Source sleeptracker.com