Renee Neltner
Throughout the night, during each sleep cycle (light, deep, or REM sleep), there have been studies that show that you move differently. The app 'Sleep Cycle' has been calibrated based on those studies to calculate how well you were sleeping throughout the night.
Since this app needs to detect the movements that you make in your sleep, it works with a device within the phone called an accelerometer. Once the accelerometer is calibrated with the app, it becomes extremely sensitive to motion, which allows it to graph each movement that is made.
Sleep quality is measured through the use of two different factors:
1-the amount of movement that is made
2-the total time that you were sleeping
This app is basically using the idea that the more that you sleep, the less you actually move. This is how it determines the quality of sleep that is calculated.
Sources:
http://www.sleepcycle.com/support.html
http://www.sleepcycle.com/howitworks.html
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