ORP (Odds Ratio Product) Sleep Depth, is a continuous measure of sleep that ranges from 0.0 (very deep sleep) to 2.5 (wakefulness). This number reflects how deep your sleep is and reflects how readily you can be interrupted, or woken up from sleep. The deeper your sleep, the harder it is for you to wake up.
ORP is a patented, clinically-validated algorithm that provides a continuous measure of sleep depth ranging from 0 to 2.5. This can only be derived using brainwave data from electroencephalography or EEG. ORP predicts arousability from sleep with over 95% accuracy.