A free, equipment-free guided relaxation practice that brings the body to the edge of sleep while staying aware. Strongest evidence is for calming the stress response, lowering stress hormones, easing anxiety, improving sleep, and modestly lowering blood pressure. One of the safest tools available; effects on mood and pain are more modest and studies are low quality. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Resting blood pressure | ~110–120 / 70–78 mmHg | Primary objective target for the practice's cardiovascular effect |
| Resting heart rate | 55–70 beats/min | Reflects parasympathetic tone and recovery |
| Heart rate variability (rMSSD) | Higher is better; track personal trend | Sensitive marker of autonomic balance and stress resilience |
| Morning cortisol / cortisol awakening response | Robust morning peak with a healthy daytime decline | Direct readout of stress-axis regulation |
| Fasting glucose / HbA1c | Fasting 75–90 mg/dL; HbA1c <5.4% | Captures any metabolic benefit from stress reduction |
| hs-CRP | <1.0 mg/L | Tracks low-grade inflammation linked to chronic stress and aging |
Cadence: Baseline, 4 weeks, 8–12 weeks, then every 3–6 months; blood pressure and subjective measures weekly during the first month