A free bedtime meditation with a fixed breath pattern — short inhale, long hold, short exhale, silent phrase — for eleven to thirty-one minutes nightly. In adults with long-standing trouble falling asleep, a routine built around it beat sleep education, gains persisting past training. Two studies, one researcher with a stake in the practice. Everything beyond sleep is borrowed. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Time to fall asleep (sleep diary) | Under 20 minutes | The primary endpoint the practice targets |
| Sleep efficiency (sleep diary) | 85–92% | Captures continuity, not just onset |
| Insomnia Severity Index | 0–7 (no clinical insomnia) | Validated severity scale, comparable to trial data |
| Pittsburgh Sleep Quality Index | 5 or below | Covers the past month, smoothing diary noise |
| Nocturnal resting heart rate (wearable) | Within 3 bpm of personal best 14-night baseline | Objective marker of overnight autonomic state |
| Nocturnal heart rate variability (wearable) | No established target — a sustained rise above the personal 14-night baseline | Indexes vagus-nerve activity, the proposed mechanism |
| Resting blood pressure | Under 120/80 mmHg | Downstream target of both slow breathing and better sleep |
| High-sensitivity C-reactive protein | Under 1.0 mg/L | Low-grade inflammation rises with chronic sleep loss |
| Hemoglobin A1c | 4.8–5.4% | Sleep restriction degrades glucose control within days |
| Morning cortisol | 10–15 µg/dL at 30 minutes after waking | Indexes the overnight stress-hormone axis |
| Epworth Sleepiness Scale | 0–7 | Distinguishes better sleep from merely more time in bed |
Cadence: Baseline testing begins two weeks before the first session. The sleep diary and the Insomnia Severity Index repeat at week 4 and week 8, the wearable metrics run continuously, and the blood draw and blood pressure repeat at 6 months and then every 6 to 12 months.