WHOOP Sleep Performance is a measure of the amount of total sleep you got (Hours of Sleep) as a function of the total amount of sleep you needed (Sleep Needed). Sleep Performance is reported on a 0-100% scale, with 100% indicating that you achieved all the Sleep you needed for the night.
Sleep Performance is a key component of your Recovery, and dedication to Sleep has been shown to improve athletic performance. WHOOP data demonstrates that both time spent asleep and time spent in REM sleep are positively correlated with performance.
WHOOP uses advanced sleep monitoring technology to accurately capture the true amount of time you are sleeping, not just the amount of time you spent in bed.