How is light vs deep sleep determined?

There is a direct correlation between micro-motions of the body during sleep and sleep cycles. MotionX-365 is the product of years of technology development based on the biomechanics of natural human motion and the mechanics of machine motion. Using the medical gold standard of Polysomnography, Fullpower’s MotionX Sensor-Fusion engine analyzes millions of anonymous nights of sleep and validates and continually improves the accuracy and reliability of MotionX-365.