Sources: health-report-2026-07-17-to-2026-07-18.json (Apple Watch sleep stages, exported 09:40 on 07-18) + OSCAR_Greg_by_Day_2026-07-17.csv (ResMed AirSense/AirFlow 11 via OSCAR). Matched by calendar date of sleep-session start (23:44 on 07-17).
RERA streak ends: RERA = 0 tonight, breaking the 5-night consecutive streak (07-12–07-16). The streak ran 3, 3, 3, 4, 3 across five nights; tonight scores zero for the first time since 07-11. This is the most significant development in the current dataset. The end of the streak coincides with the best awake time in recent history (7.0 min) and the highest REM % observed in any recent matched night (30.0%), consistent with the hypothesis that RERA events were causing micro-arousals that fragmented sleep architecture.
REM = 30.0% (111.9 min) — highest in the matched-nights dataset. On the six prior nights with stage data, REM ranged 17.8%–25.9%. Tonight's 30.0% likely reflects two factors: (a) reduced arousal burden with RERA=0, and (b) a longer sleep opportunity (6.21h total sleep vs. 5.65h on 07-16) that permitted fuller REM cycling in the second half of the night.
Awake = 7.0 min — among the lowest recorded. The prior 7-day average awake time was ~14.1 min. A 50% reduction on the same night RERA drops to zero is notable directional evidence, though a single night is insufficient to establish causation.
AHI = 2.78 — exactly at the 7-day average (2.78), nothing unusual. OA=12 is moderately elevated compared to recent low-AHI nights (07-13: OA=3, 07-16: OA=6), but the 6.48h usage denominator keeps the index unremarkable. No pattern concern.
| Metric | Value |
|---|---|
| Bedtime (session start) | 23:44 |
| Time in bed | 6.33 h (6h 19.8m) |
| Total sleep duration | 6.21 h (6h 12.8m) |
| Sleep efficiency (TST/TIB) | 98.2% |
| Awake time | 7.0 min |
| Core sleep | 3.33 h (199.7 min) — 53.6% |
| Deep sleep | 1.02 h (61.2 min) — 16.4% |
| REM sleep | 1.86 h (111.9 min) — 30.0% |
| CPAP usage | 6.48 h |
| AHI | 2.78 |
| RDI | 2.78 |
| OA / H / CA / UA / RERA | 12 / 6 / 0 / 0 / 0 |
| Pressure avg | 8.85 cmH₂O |
| Pressure 90th %ile | 10.84 cmH₂O |
| Leak avg | 0.27 L/min |
| Leak 90th %ile | 1.2 L/min |
| 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 | 1.50 | 3 | 0.13 | 16.6% | 20.6% | 12.5 |
| 07-17 | 2.78 | 0 | 0.27 | 16.4% | 30.0% | 7.0 |
Updated correlations — RERA as arousal driver:
Comparing nights within the RERA streak vs. RERA=0 nights in the recent 7-night window:
The awake-time comparison is confounded: 07-11 had the worst awake in the window (24.6 min) despite RERA=0, while 07-17 had the best (7.0 min). This underscores that RERA is not the only arousal driver — AHI=4.66 on 07-11 was the highest in the window and likely explains that night's fragmentation. Tonight's RERA=0 with moderate AHI=2.78 and low leak=0.27 produced the cleanest outcome in the dataset, which is directionally consistent with the prior hypothesis.
What ended the RERA streak? No obvious single variable changed — leak (0.27) and pressure (8.85) are similar to recent nights. The most likely explanation is positional: RERA is sensitive to sleep position and body habitus, and the streak ending without any equipment change suggests a behavioral or positional shift. If RERA=0 persists for 2+ more nights, that would argue strongly for positional as the primary driver (something changed in how/where sleep is being done). If RERA returns tomorrow, one RERA=0 night may just be noise.
| Metric | Tonight (07-17) | 7-day avg (07-10–07-16) | 30-day avg (06-16–07-15) |
|---|---|---|---|
| AHI | 2.78 | 2.78 | 2.56 |
| RERA | 0 | 2.29 | 1.23 |
| Leak avg (L/min) | 0.27 | 0.32 | 0.93* |
| Pressure avg (cmH₂O) | 8.85 | 8.88 | 6.89† |
| Usage hours | 6.48 | 6.61 | 6.40 |
| Deep sleep % | 16.4% | ~15.1%‡ | ~17%‡ |
| REM sleep % | 30.0% | ~22.5%‡ | ~23%‡ |
| Awake time (min) | 7.0 | ~14.1‡ | ~17‡ |
*Leak 30-day avg elevated by earlier high-leak nights (07-01: 6.22 L/min).
†Pressure 30-day avg depressed by zero-pressure nights (Jun 15–22).
‡Sleep-stage trailing averages approximate; not all nights have Apple Watch stage data.
Weekly RERA trend:
| 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 (prior partial) | 2.28 | 3.25 | 4 |
| 07-17 | 2.78 | 0.00 | 1 |
The prior partial week (07-13–07-16) remained the structural concern: RERA avg of 3.25 was far above any prior week. Tonight's RERA=0 resolves that streak but is only one night — next 2–3 nights will determine whether this is a durable shift or a single-night interruption.
Pressure_90th (not Pressure_95th as in the historical oscar_data.csv). Reported as 90th %ile accordingly.