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Modern wearables analyze your sleep architecture — light, deep, and REM stages — using heart rate, HRV, movement, and blood oxygen sensors. Learn how the technology works and how to use sleep data to genuinely improve your rest.

Heart Rate Variability (HRV) is one of the most powerful health metrics available on modern wearables. Learn what HRV measures, why higher is better, and how continuous tracking can optimize your recovery, stress management, and overall wellness.