Research
Hormonal
Non-REM (NREM) sleep is characterized by increased parasympathetic modulation and higher cardiovascular complexity compared to REM sleep, serving as a restorative phase.
Prioritize deep, uninterrupted NREM sleep for cardiovascular recovery. This phase is associated with lower heart rate, blood pressure, and higher autonomic complexity, which are beneficial for long-term heart health.
GoodSupportsHIGH confidence
transition from wake to NREM sleep is associated with a gradual increase in parasympathetic modulation... NREM sleep is characterized by an increased Sample Entropy
Why this rating
Based on multiple studies cited regarding HRV during NREM sleep.
Source
Heart rate variability in normal and pathological sleep
Eleonora Tobaldini et al. · Frontiers in Physiology · 2013
DOI 10.3389/fphys.2013.00294
narrative_reviewCited 371×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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