Day 29 of 30. The penultimate post.

Tomorrow is Day 30. After that, a final review. Today is the second-to-last data drop, and it has a small drama tucked inside it: my CPAP mask fell off while I slept.

I went to bed late. I don’t remember taking the mask off. I woke at 4:49am to find it on the pillow beside me — not on my face. I put it back on and slept until 7:20am. The myAir machine logged the disruption faithfully: 4 hours 35 minutes of usage, three “mask off” events, 3.4 events per hour, and a score of 75. The app calls 75 “a great score.” I’d call it a near miss.

This is exactly the failure mode the positional sleep therapy vest was meant to prevent — and, crucially, didn’t quite. The vest stops me rolling onto my back. It does not stop a half-asleep arm from yanking a nasal pillow loose at 3am. Different problem, different fix.

Why my CPAP mask is falling off

Three candidates, in order of likelihood:

The smaller nasal pillow size from Day 9 still isn’t quite settled. I switched from medium to small for a better seal. The seal improved. The nose-bridge soreness arrived. And now, possibly, the tighter fit transfers more pressure into the headgear, so I loosen the straps to compensate, and the strap loosening is what lets the mask come off. You can see where this is going.
Late bedtime. Tired and clumsy is no way to fit a CPAP mask. The setup matters more than people think.
A side roll with the hose pinned underneath. Classic displacement scenario — hose tugs, seal breaks, half-conscious hand finishes the job.

I don’t yet know which it was. I’ll be paying more attention tonight.

The weight reality on Day 29

Hume Pod: 101.9 kg (with the red up-arrow the app likes so much). Eufy: 101.80 kg.

Effectively the same number that’s been on these scales all week. The honest read on the 30-day arc is this: 88 kg was always a directional target, not a 30-day finish line. I’m not going to wake up tomorrow at 88 kg. I’m not even going to wake up at 99 kg. What I have, after 29 days, is a much sharper understanding of what these four devices think about my body — and how their stories agree, disagree, or contradict each other within the same brand. That was the editorial point all along.

Today’s numbers

Weight & body composition (Eufy, 14:47)

Weight: 101.80 kg — HIGH
BMI: 28.4 — HIGH
Body fat: 30.6% — EXTREMELY HIGH
Body fat mass: 31.10 kg — EXTREMELY HIGH
Water: 49.4% — LOW
BMR: 1,756 kcal — LOW

Hume Pod

Weight: 101.9 kg
Metabolic Momentum: 5 (down)
Metabolic Capacity: 30 (estimated)
Strain: 0
Recovery: 11

A recovery score of 11/100 tracks: bad sleep, no strain logged, weight static, mask incident. The number isn’t lying.

Sleep

Hume Band (total sleep session): 6h 26m
Fitbit (time asleep): 4h 9m — sleep score 70, “Fair”
Fitbit timeline: 02:21–07:18, awake 47 minutes
CPAP usage (myAir): 4h 35m, score 75, 3.4 events/hr, mask off 3 times

The gap between the Hume Band’s session figure and the Fitbit’s time-asleep figure is wider than usual today, which makes sense — I was in bed longer than I was actually asleep, and there were two distinct sleep windows separated by my mask-finding expedition.

Vitals (Hume Band)

Resting heart rate: 62 bpm
HRV: 69.0 ms
Stress level: 20.3
SpO2 overnight: 97–98%
Body temperature: 36.2–36.7 °C

The SpO2 holding at 97–98% is the headline good news. Even with the mask off for part of the night, the band didn’t pick up serious desaturation — a meaningful contrast with the early days of this experiment, when the overnight oxygen numbers were a real concern.

Blood pressure (best of two readings this afternoon)

124/87, HR 69 (best)
127/84, HR 81

Both flagged HIGH on systolic and diastolic. Average across the two: 126/86, HR 75. BP, like weight, is being stubborn this week.

Plan for the rest of Day 29

Cycling. Outdoor, on the bike. No gym, no treadmill, no programmed workout — just a ride before the light goes. Strain of 0 won’t survive the afternoon.

Tomorrow is Day 30. Then the final review. Almost there.