Sources: health-report-2026-07-16-to-2026-07-17.json (Apple Watch sleep stages, exported 05:24 on 07-17) + OSCAR_Greg_by_Day_2026-07-16.csv (ResMed AirSense/AirFlow 11 via OSCAR). Matched by calendar date of sleep-session start (22:49 on 07-16).
RERA streak extends to 5 consecutive nights (07-12 through 07-16) — the longest in the dataset. RERA≥3 has now persisted for five straight nights: 3, 3, 3, 4, 3. The prior report treated 4 nights as a structural signal; 5 nights strengthens that case considerably. Despite tonight's RERA=3 occurring alongside the cleanest mask seal yet (Leak_Avg=0.13 L/min), awake time was 12.5 min — higher than the two preceding nights (5.0 and 10.5 min). This is a subtle but important nuance: the RERA-disruption relationship appears more variable than the simple leak-mediator hypothesis suggested. Positional/anatomical factor is the most consistent explanation across all 5 nights.
AHI=1.5 — lowest since late June, well below both 7-day (2.87) and 30-day (2.59) baselines. Despite the persistent RERA, tonight's obstructive and hypopnea burden was very light. The combination of AHI=1.5 and RERA=3 means the device is registering sustained flow limitation (RERA) without those events escalating to scored events — a pattern consistent with positional or anatomical upper-airway narrowing that is subthreshold for the scoring algorithm on most events but crosses it for RERA.
Leak=0.13 L/min — the dataset low in the matched-nights era. The mask seal tonight was the cleanest recorded, yet RERA persists unchanged. This effectively rules out mask leak as a driver of the RERA events themselves; leak may still modulate whether RERA events cause arousals (see correlations below), but the events are occurring independent of any seal issue.
Shorter night: 5h 51m in bed vs. 6h+ typical. Total sleep was 5h 39m. Deep and REM are within acceptable range but a shorter sleep opportunity is worth noting in the context of ongoing RERA surveillance.
| Metric | Value |
|---|---|
| Bedtime (session start) | 22:49 |
| Time in bed | 5.86 h (5h 51.7m) |
| Total sleep duration | 5.65 h (5h 39.2m) |
| Sleep efficiency (TST/TIB) | 96.4% |
| Awake time | 12.5 min |
| Core sleep | 3.55 h — 62.9% |
| Deep sleep | 0.94 h (56.2 min) — 16.6% |
| REM sleep | 1.16 h (69.7 min) — 20.6% |
| CPAP usage | 6.0 h |
| AHI | 1.5 (dataset-low tier) |
| RDI | 2.0 |
| OA / H / CA / UA / RERA | 6 / 3 / 0 / 0 / 3 |
| Pressure avg | 8.55 cmH₂O |
| Pressure 90th %ile | 11.42 cmH₂O |
| Leak avg | 0.13 L/min (dataset low) |
| Leak 90th %ile | 0* (see caveats) |
| Date | AHI | RERA | Leak (avg) | Deep % | REM % | Awake (min) |
|---|---|---|---|---|---|---|
| 07-11 | 4.66 | 0 | 0.15 | 14.3% | — | 24.6 |
| 07-12 | 2.70 | 3 | 0.68 | 12.6% | — | 16.1 |
| 07-13 | 1.44 | 3 | 0.53 | 11.4% | — | 16.1 |
| 07-14 | 3.18 | 3 | 0.30 | 19.3% | 17.8% | 10.5 |
| 07-15 | 3.01 | 4 | 0.25 | 16.1% | 25.9% | 5.0 |
| 07-16 | 1.5 | 3 | 0.13 | 16.6% | 20.6% | 12.5 |
Updated correlations across all 6 nights:
The leak-as-mediator hypothesis from the July 15 report holds directionally but tonight introduces a complicating data point. Grouping by leak threshold (≥0.35 vs <0.35 L/min):
The low-leak grouping still outperforms high-leak nights on both awake time and deep sleep, but tonight's 12.5 min awake is notably higher than the 07-14 and 07-15 values within that group. Possible explanations: (a) the shorter sleep opportunity (5.86h vs 6.3-6.65h) may compress recovery windows; (b) REM at 20.6% vs 25.9% on 07-15 could reflect timing (an earlier wake-up may truncate final REM cycles); (c) random night-to-night variation in arousal threshold. The sample is too small to distinguish these.
AHI vs. RERA divergence tonight: OA=6, H=3, RERA=3 with AHI=1.5 means the 6 obstructive events and 3 hypopneas were brief (low index given 6h usage) while 3 additional RERA events were scored. The pattern where RERA persists independently of AHI level is consistent across the 5-night streak — AHI has ranged from 1.44 to 4.66, RERA has stayed at 3-4.
| Metric | Tonight (07-16) | 7-day avg (07-09–07-15) | 30-day avg (06-16–07-15) |
|---|---|---|---|
| AHI | 1.5 | 2.87 | 2.59 |
| RERA | 3 | 2.14 | 1.14 |
| Leak avg (L/min) | 0.13 | 0.52 | 0.96 |
| Pressure avg (cmH₂O) | 8.55 | 8.69 | 6.83* |
| Usage hours | 6.0 | 6.70 | 6.41 |
| Deep sleep % | 16.6% | ~14.8%† | ~17.3%† |
| REM sleep % | 20.6% | ~22.5%† | ~23%† |
| Awake time (min) | 12.5 | ~14.7† | ~17† |
*Pressure 30-day avg is depressed by zero-pressure nights (June 15–22). †Sleep-stage trailing averages are approximate; not all nights have Apple Watch stage data.
Weekly AHI and RERA trends:
| Week | AHI avg | RERA avg | n |
|---|---|---|---|
| 06-15–06-21 (baseline) | 0.76 | 0.00 | 6 |
| 06-22–06-28 | 2.84 | 0.86 | 7 |
| 06-29–07-05 | 3.24 | 1.29 | 7 |
| 07-06–07-12 | 3.00 | 1.14 | 7 |
| 07-13–07-16 (partial) | 2.28 | 3.25 | 4 |
The current partial week shows a meaningful split: AHI is declining back toward earlier levels (2.28, trending down from the 3.00–3.24 plateau) while RERA is surging to its highest weekly average (3.25 vs. 0.00–1.29 in all prior weeks). This divergence — improving scored-event burden with worsening flow-limitation signal — is the single most important pattern in the current dataset.