Sleep Auto-Detection is a feature that detects when you fall asleep and wake up and then logs that period as Sleep. Using Sleep Auto-Detection, you can track your Sleep and receive your Recovery without having to manually start and stop or add your Sleep.
The WHOOP system looks for changes in your heart rate, heart rate variability, and activity patterns typical of Sleep to determine when you went to bed and woke up. Sleep Auto-Detection will detect any period of Sleep longer than one hour and will log it as a Sleep or a Nap depending on when it falls in your typical day.
If you wake up and WHOOP has detected a Sleep (but is waiting to make sure you’re fully awake before ending it), you may see a “Sleep Detected – Process Now” entry on your Overview screen, as pictured below. Tapping “Process Now” will let WHOOP know that you are not planning on extending this sleep and the system will therefore begin processing your Sleep activity.
Auto-detected Sleeps and naps behave just like user-submitted sleeps and naps, meaning they generate sleep stages, Sleep Performances, and Recoveries.