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HRV During Sleep
Heart rate variability (HRV) during sleep shows how well the body recovers overnight. Many wearables analyze nighttime HRV to estimate recovery, stress and overall health.
Why HRV Increases During Sleep
During deep sleep the parasympathetic nervous system becomes more active. This phase supports recovery and restoration.
Heart rate typically slows down and HRV often increases, indicating that the body is recovering effectively.
Factors That Influence Nighttime HRV
- sleep quality
- stress levels
- training load
- alcohol consumption
- illness or inflammation
HRV and Sleep Stages
HRV changes throughout the night. It often increases during deep sleep and may fluctuate during REM sleep as brain activity increases.
Learn more about sleep stages and deep sleep vs REM sleep.
How to Improve Nighttime HRV
- consistent sleep schedule
- stress management
- proper recovery after training
- avoiding alcohol before sleep
- good sleep environment