What is the Whoop sleep tracker and how does it work?

The Whoop sleep tracker is an advanced performance-monitoring and analytics device designed to measure various physiological parameters to optimize users' sleep patterns, recovery, and overall fitness. It operates through a wearable strap that continuously collects biometric data such as heart rate, heart rate variability (HRV), ambient temperature, motion, and skin conductance. By analyzing these metrics, Whoop's proprietary algorithms provide insights into the user's sleep stages (light, REM, deep), disturbances, respiratory rate, and overall sleep quality. The device primarily works via the accompanying smartphone app, where users can access detailed analytics, personalized recommendations, and see how their daily activities affect their sleep and recovery to make informed decisions about training and lifestyle habits.