Sources: health-report-2026-07-27-to-2026-07-28.json (Apple Watch sleep stages, exported 06:26 on 07-28) + OSCAR_Greg_by_Day_2026-07-27.csv (ResMed AirSense/AirFlow 11 via OSCAR). Matched by calendar date of sleep-session start (23:20 on 07-27).
Awake time collapsed to 5.5 minutes — the lowest of the entire tracked history — breaking the two-night streak of elevated awake time (07-25: 30.6 min, 07-26: 26.6 min) flagged as an unresolved pattern in the prior report. Efficiency jumped to 98.5%, also a multi-week high. This happened despite leak ticking back up to 1.19 L/min (above both the 7-day and 30-day trailing averages) — a genuine counterexample to any simple "leak drives awake time" story, and consistent with the weak correlations below.
Leak avg (1.19 L/min) is the 3rd-highest of the last 14 nights (behind only 07-25's 1.69 and 07-22's 1.08), running about 1.7x the trailing 7-day average (0.71) and 1.4x the trailing 30-day average (0.82). It's a single-night uptick, not a multi-night trend — 07-26 was low (0.39) immediately before it — and AHI/OA stayed unremarkable (1.6 / 8), so this does not look like a repeat of the 07-25 spike (AHI 1.72, OA 10, leak-90th 7.2 vs. tonight's leak-90th of 2.4).
Pressure avg (6.87 cmH₂O) is the lowest reading in the last several weeks — below both trailing averages (7-day 7.46, 30-day 8.41). No adverse effect apparent (AHI and awake time both good); logged for tracking, not a concern on its own.
Deep sleep (18.0%) held above both trailing averages for a second straight night, continuing the recovery from the 07-25 low (9.9%) flagged in prior reports.
| Metric | Value |
|---|---|
| Bedtime (session start) | 23:20 |
| Time in bed | 6.15 h (368.8 min) |
| Total sleep duration | 6.05 h (363.3 min) |
| Sleep efficiency (TST/TIB) | 98.5% — multi-week high |
| Awake time | 5.5 min — lowest on record |
| Core sleep | 3.68 h (220.8 min) — 60.8% |
| Deep sleep | 1.09 h (65.2 min) — 18.0% |
| REM sleep | 1.29 h (77.3 min) — 21.3% |
| CPAP usage | 6.23 h |
| AHI | 1.6 |
| RDI | 1.6 |
| OA / H / CA / UA / RERA | 8 / 2 / 0 / 0 / 0 |
| Pressure avg | 6.87 cmH₂O — lowest in recent weeks |
| Pressure 90th %ile | 9.92 cmH₂O |
| Leak avg | 1.19 L/min — 3rd-highest of last 14 nights |
| Leak max | 26.4 L/min |
| Leak 90th %ile | 2.4 L/min |
| Date | AHI | OA | RERA | Leak avg | Leak 90th | Deep % | Awake (min) | Efficiency |
|---|---|---|---|---|---|---|---|---|
| 07-20 | 0.94 | 2 | 0 | 0.03 | 0.0 | 8.3% | 21.1 | 94.4% |
| 07-21 | 0.88 | 4 | 1 | 0.85 | 1.2 | 28.4% | 27.1 | 93.3% |
| 07-22 | 1.59 | 7 | 1 | 1.08 | 2.4 | 12.0% | 10.0 | 97.5% |
| 07-23 | 1.29 | 7 | 0 | 0.48 | 2.4 | 25.5% | 13.0 | 96.8% |
| 07-24 | 2.34 | 15 | 0 | 0.48 | 0.0 | 16.7% | 24.6 | 93.9% |
| 07-25 | 1.72 | 10 | 0 | 1.69 | 7.2 | 9.9% | 30.6 | 92.5% |
| 07-26 | 1.24 | 5 | 0 | 0.39 | 0.0 | 14.3% | 26.6 | 92.9% |
| 07-27 | 1.6 | 8 | 0 | 1.19 | 2.4 | 18.0% | 5.5 | 98.5% |
Split at leak ≤ 0.30 vs. > 0.30 L/min (07-27's leak of 1.19 falls well into the higher-leak bucket):
the user r (leak avg vs. deep %): −0.33 (n=36). the user r (leak avg vs. awake min): +0.12. the user r (AHI vs. awake min): +0.20. the user r (AHI vs. deep %): −0.02.
Interpretation: The leak→deep-sleep relationship is the only one with a moderate signal (higher-leak nights average ~3 points lower deep sleep). The leak→awake-time and AHI→awake-time links remain weak (|r| ≤ 0.2) and tonight is a clear outlier within that noisy relationship: a higher-leak night (1.19) paired with the single lowest awake-time reading in the dataset. That's a second consecutive report where the data undercuts a simple "leak/AHI drives awake time" narrative — treat these correlations as weak tendencies, not predictive of any given night.
| Metric | Tonight (07-27) | 7-day avg (07-21–07-27) | Prior 7-day avg (07-20–07-26) | 30-day avg (06-28–07-27) |
|---|---|---|---|---|
| AHI | 1.6 | 1.52 | 1.43 | 2.45 |
| Leak avg (L/min) | 1.19 | 0.88 | 0.71 | 0.82 |
| Pressure avg (cmH₂O) | 6.87 | 7.30 | 7.46 | 8.41 |
| Usage hours | 6.23 | 6.65 | 6.77 | 6.58 |
| Deep sleep % | 18.0% | 16.4% | 16.4% | 16.7% |
| REM sleep % | 21.3% | 25.9% | 26.4% | 24.5% |
| Awake time (min) | 5.5 | 19.8 | 21.9 | 16.5 |
AHI (1.6) and leak (1.19) both ticked up slightly relative to the trailing windows, but pressure and deep sleep both look good — deep sleep sits above both the 7-day and 30-day averages. Awake time is the standout: roughly a quarter of the trailing 7-day average and a third of the 30-day average — the best night in this metric in the entire dataset.
| Week | AHI avg | Leak avg | n |
|---|---|---|---|
| 06-22 to 06-28 | 2.84 | 1.98 | 7 |
| 06-29 to 07-05 | 3.24 | 1.41 | 7 |
| 07-06 to 07-12 | 3.00 | 0.43 | 7 |
| 07-13 to 07-19 | 2.22 | 0.42 | 7 |
| 07-20 to 07-26 (prior trailing 7d) | 1.43 | 0.71 | 7 |
| 07-21 to 07-27 (current trailing 7d) | 1.52 | 0.88 | 7 |
The multi-week AHI downtrend flattened out and ticked up slightly (1.43 → 1.52) as 07-20's very low reading (0.94) aged out of the window and tonight's 1.6 aged in — still well below the 06-22–07-19 range of 2.22–3.24. Trailing leak also rose modestly (0.71 → 0.88), driven mainly by tonight's 1.19; five of the seven nights in the current window remain at or below 1.08.
The awake-time/efficiency question from the last two reports appears resolved, at least for one night: 07-27 posted the best awake-time and efficiency readings in the dataset, even with leak and AHI both modestly elevated relative to trailing averages. This is evidence against CPAP therapy metrics being the main driver of the 07-25/07-26 disruption — supporting the "one-off rough patch" explanation over an ongoing CPAP-linked issue. Worth continuing to watch: if awake time creeps back up over the next few nights without a corresponding leak/AHI signal, that would further support a non-CPAP cause (routine, stress, alcohol, room conditions, etc.).
Leak and pressure: Tonight's higher leak (1.19) and unusually low pressure (6.87) are both single-night readings without an accompanying AHI/OA problem. No action needed unless leak elevation recurs on 07-28.
Deep sleep: Fully recovered from the 07-25 dip (9.9% → 14.3% → 18.0%) and now running above both trailing averages for a second night.
oscar_data.csv) — these nights are included in the leak ≤0.30 bucket in Section 2 as literal low readings, but a 0.0 value that early in the tracked history may reflect incomplete data capture rather than a true zero-leak night. Flagged for awareness; not excluded, consistent with how this bucket has been treated in prior reports.