Understanding Sleep Data
Why is heart rate variability measured during sleep more useful than daytime HRV?
Why Your Heart Rate Variability During Sleep Matters More Than You Think
Heart rate variability reflects small differences in timing between heartbeats and can provide insight into stress and recovery. Daytime readings are affected by movement, posture, caffeine and daily activity, while sleep provides a more consistent environment for measurement. Watching overnight HRV trends may help reveal how stress, alcohol, late meals, illness and daily habits affect recovery over time.