Summary
Study confirmed that HRV measurements during sleep are reliable across different sleep stages and even during disrupted sleep, supporting the use of overnight HRV for health assessment.
Methods
Polysomnography study measuring HRV reliability across sleep stages
Key Findings
- High-frequency HRV reliable across N2, deep sleep, and REM
- Correlations ranged from r=0.70 to r=0.88 across stages
- Reliability maintained even during disrupted sleep
- Supports overnight HRV as valid health metric
Limitations
Lab-based study may differ from home monitoring
What This Means for You
Your overnight HRV is reliable regardless of sleep architecture. Whether you get more deep sleep or REM on a given night, the HRV measurement remains a valid indicator of autonomic function.
Source
Read the original paper in American Journal of Physiology ↗
Added to HRV Zone: 2025-01-07