NSDR / Yoga Nidra (N=1 Data)
Wearable N=1 logs show modest HRV gains after short daily NSDR / Yoga Nidra blocks; a 2025 systematic review and meta-analysis (73 studies) reports large pooled Hedges' g signals for stress, anxiety, and depression with explicit low–quality / heterogeneity caveats—see linked PubMed row.
N=1 Evidence
- Leanne: Daily NSDR / Yoga Nidra (10-30 min) for 7 days vs 7-day control week
- Higher avg HRV + lower avg RHR vs control
- Stress Management Score: 83/100 by Day 5
Small effect, short duration, well-structured with control week.
Pooled human literature (PubMed-first; practice ≠ brand)
Ghai et al. 2025 (Ann N Y Acad Sci; PMID 41327816; ghai-2025-yoga-nidra-stress-anxiety-depression-meta) systematically pooled 73 yoga-nidra studies (n = 5,201) on stress, anxiety, and depression—abstract reports large negative Hedges' g directions versus active and versus no / passive comparators, while warning that risk of bias and delivery heterogeneity likely inflate magnitudes. Informal NSDR scripts are not automatically identical to coded interventions; keep wearable rows above as N=1 calibration only.
Tertiary map
Wikipedia: Yoga nidra (wikipedia-yoga-nidra-overview) defines the classical guided-relaxation practice that informal NSDR content often parallels—pooled mood / stress effect sizes stay on the PubMed row above; HRV device deltas here remain self-experiment tier unless replicated in linked clinical work.