How does the Oura Ring track and measure sleep?

The Oura Ring is a sophisticated wearable device designed to track and measure sleep through various sensors that are embedded in the ring. It uses a combination of body temperature monitoring, motion detection, and heart rate variability (HRV) analysis to provide insights into the wearer's sleep patterns. As the user sleeps, the ring continuously records the fluctuating body temperature, signaling changes in sleep stages. The accelerometer and gyroscope within the ring detect movements, allowing it to determine when the user is awake or asleep and identify periods of light, deep, and REM sleep. Additionally, by monitoring the pulsatile blood flow from the finger's arteries, the Oura Ring assesses HRV and resting heart rate, which are crucial indicators of both sleep quality and overall health. By analyzing this data, the Oura Ring offers detailed feedback on sleep duration, efficiency, and disturbances, helping users understand their sleep patterns and offering suggestions for improvement.