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date, type, tags
date type tags
2026-09-08 sleep
sleep
early-bedtime
hrv-above-range
rebound

Sleep — 2026-09-08

8h 40min · 22:59→07:40 · REM: 7% · Deep: 22% · HRV: 145 · Resting HR: 48 · Woke: 1× · Score: 79/100

"HRV was higher than ever today." — the Tuesday-morning rebound after Monday's 32ms low.

Interpretation: The crash-and-bounce in 24 hours: 32ms (Sep 7) → 145ms (Sep 8) — a tie with the Sep 2 all-time high (145ms), back ABOVE the watch's personal range (77137ms). Bedtime 22:59 (pre-midnight, the cleanest high-HRV lever) on a sober night, 8h40 of sleep, resting HR 48 at the very bottom of range — the textbook recovery shape after the 4h/32ms Sunday-night bill. The 22:59 bedtime is the same lever that produced the Sep 2 record (23:50).

The oddity is the architecture: score only 79, REM 7% (Low, ref 1030%) and light sleep 71% (High, ref <55%) — 38 min of REM on an 8h40 night. This is what debt-repayment nights look like: the body spent the night on repair (deep 22%, continuity 78) and shorted dreaming. The REM deficit is the hangover of the alcohol night two nights back, still working through. HRV says recovered; the sleep stages say one more clean night before calling it fully settled.

Metric Value Reference
Night sleep 8h 40min 6-10h (Normal)
Bed → Rise 22:59 → 07:40
Deep sleep 22% (1h 55min) 20-60% (Normal)
Light sleep 71% (6h 7min) <55% (High)
REM sleep 7% (38min) 10-30% (Low)
Deep sleep continuity 78 points 70-100 (Normal)
Times woke 1 time 0-1 (Normal)
Breathing quality 98 points 70-100 (Normal)
HRV 145ms 77-137ms (Above range)
Resting HR 48 bpm 48-58 bpm (Within range, bottom)
SpO2 98% 97-99% (Within range)
Respiratory rate 13 brpm 12-16 brpm (Within range)
Score 79 / 100 Better than 64%

HRV progression

Date HRV Context
Sep 4 111ms Sober, sleep onset 02:11, 5h45
Sep 5 98ms Sober, 23:15 bed, 10h17 debt-repayment sleep, deep 39%
Sep 6 74ms 0% beers ×4, home late 01:11, residual illness — infection signature
Sep 7 32ms Heavy night, ~4h sleep — near all-time low (chat-reported, no screenshot)
Sep 8 145ms 🚀 Sober, bed 22:59, 8h40, resting HR 48 — ties Sep 2 all-time high

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