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Summary for coffee
📔 Journal
Mentioned 14 days · avg mood 3.0/5 · last 2d ago
Your body across 14 matching days with Garmin data
Body Battery high → low93 → 38
Sleep7.1h
Stress38
HRV66 ms
Resting HR53 bpm
Steps11,380
SpO₂96%
Respiration14 br/min
Deep sleep1.4h
Light sleep3.7h
REM sleep1.6h
Awake0.4h
Backward test↔ Forward test

Two ways to test a hunch: a backward test analyses the history you already have, and a forward test (an experiment) watches it play out from today. Same question, same stats — two lenses.

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Timeline

14 matching days
Sat 22 Aug Journal · 4/5 6.8h 68 ms 50 bpm 87 → 28 13,483 35 96% 14 br/min 1.2h 3.9h 1.4h 0.3hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low87 → 28
Sleep6.8h
Stress35
HRV68 ms
Resting HR50 bpm
Steps13,483
SpO₂96%
Respiration14 br/min
Deep sleep1.2h
Light sleep3.9h
REM sleep1.4h
Awake0.3h
Mon 17 Aug Journal · 3/5 7.7h 75 ms 51 bpm 88 → 26 13,843 37 96% 14 br/min 1.6h 4.1h 1.6h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low88 → 26
Sleep7.7h
Stress37
HRV75 ms
Resting HR51 bpm
Steps13,843
SpO₂96%
Respiration14 br/min
Deep sleep1.6h
Light sleep4.1h
REM sleep1.6h
Awake0.4h
Sun 16 Aug Journal 7.6h 67 ms 54 bpm 88 → 46 8,676 43 96% 14 br/min 1.7h 3.9h 1.7h 0.3hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low88 → 46
Sleep7.6h
Stress43
HRV67 ms
Resting HR54 bpm
Steps8,676
SpO₂96%
Respiration14 br/min
Deep sleep1.7h
Light sleep3.9h
REM sleep1.7h
Awake0.3h
Fri 14 Aug Journal · 3/5 6.4h 72 ms 51 bpm 93 → 39 11,710 39 96% 14 br/min 1.2h 3.5h 1.3h 0.5hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low93 → 39
Sleep6.4h
Stress39
HRV72 ms
Resting HR51 bpm
Steps11,710
SpO₂96%
Respiration14 br/min
Deep sleep1.2h
Light sleep3.5h
REM sleep1.3h
Awake0.5h
Fri 7 Aug Journal · 3/5 7.6h 68 ms 52 bpm 97 → 48 6,823 43 96% 14 br/min 1.4h 4.1h 1.7h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low97 → 48
Sleep7.6h
Stress43
HRV68 ms
Resting HR52 bpm
Steps6,823
SpO₂96%
Respiration14 br/min
Deep sleep1.4h
Light sleep4.1h
REM sleep1.7h
Awake0.4h
Mon 3 Aug Journal · 3/5 7.2h 67 ms 51 bpm 96 → 36 11,457 35 96% 14 br/min 1.4h 3.8h 1.7h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low96 → 36
Sleep7.2h
Stress35
HRV67 ms
Resting HR51 bpm
Steps11,457
SpO₂96%
Respiration14 br/min
Deep sleep1.4h
Light sleep3.8h
REM sleep1.7h
Awake0.4h
Thu 30 Jul Journal 7.0h 67 ms 53 bpm 98 → 37 14,032 37 96% 14 br/min 1.5h 3.5h 1.7h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low98 → 37
Sleep7.0h
Stress37
HRV67 ms
Resting HR53 bpm
Steps14,032
SpO₂96%
Respiration14 br/min
Deep sleep1.5h
Light sleep3.5h
REM sleep1.7h
Awake0.4h
Sun 26 Jul Journal · 4/5 6.8h 69 ms 52 bpm 97 → 40 13,352 36 96% 14 br/min 1.2h 3.8h 1.5h 0.3hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low97 → 40
Sleep6.8h
Stress36
HRV69 ms
Resting HR52 bpm
Steps13,352
SpO₂96%
Respiration14 br/min
Deep sleep1.2h
Light sleep3.8h
REM sleep1.5h
Awake0.3h
Tue 14 Jul Journal · 4/5 6.8h 68 ms 55 bpm 90 → 45 8,404 42 96% 14 br/min 1.3h 3.4h 1.6h 0.5hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low90 → 45
Sleep6.8h
Stress42
HRV68 ms
Resting HR55 bpm
Steps8,404
SpO₂96%
Respiration14 br/min
Deep sleep1.3h
Light sleep3.4h
REM sleep1.6h
Awake0.5h
Wed 8 Jul Journal · 1/5 7.4h 65 ms 55 bpm 90 → 46 9,012 40 96% 14 br/min 1.3h 3.9h 1.6h 0.6hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low90 → 46
Sleep7.4h
Stress40
HRV65 ms
Resting HR55 bpm
Steps9,012
SpO₂96%
Respiration14 br/min
Deep sleep1.3h
Light sleep3.9h
REM sleep1.6h
Awake0.6h
Tue 30 Jun Journal · 2/5 6.2h 65 ms 53 bpm 94 → 31 13,989 33 96% 14 br/min 1.2h 3.0h 1.5h 0.6hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low94 → 31
Sleep6.2h
Stress33
HRV65 ms
Resting HR53 bpm
Steps13,989
SpO₂96%
Respiration14 br/min
Deep sleep1.2h
Light sleep3.0h
REM sleep1.5h
Awake0.6h
Sun 21 Jun Journal 7.3h 59 ms 57 bpm 98 → 51 6,880 41 96% 14 br/min 1.6h 3.8h 1.5h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low98 → 51
Sleep7.3h
Stress41
HRV59 ms
Resting HR57 bpm
Steps6,880
SpO₂96%
Respiration14 br/min
Deep sleep1.6h
Light sleep3.8h
REM sleep1.5h
Awake0.4h
Wed 10 Jun Journal · 3/5 7.7h 56 ms 56 bpm 96 → 30 14,060 36 96% 14 br/min 1.4h 4.1h 1.8h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low96 → 30
Sleep7.7h
Stress36
HRV56 ms
Resting HR56 bpm
Steps14,060
SpO₂96%
Respiration14 br/min
Deep sleep1.4h
Light sleep4.1h
REM sleep1.8h
Awake0.4h
Thu 28 May Journal · 3/5 7.0h 53 ms 56 bpm 90 → 30 13,603 34 96% 14 br/min 1.3h 3.8h 1.6h 0.4hdetails
Journal entry

Matched coffee in this day's entry.

Body Battery high → low90 → 30
Sleep7.0h
Stress34
HRV53 ms
Resting HR56 bpm
Steps13,603
SpO₂96%
Respiration14 br/min
Deep sleep1.3h
Light sleep3.8h
REM sleep1.6h
Awake0.4h
Biometrics on the days you mentioned coffee
14 days you mentioned it in the last 365 · Garmin data on 90 of 365 days
Window: 90d 180d 365d  ·  Effect: same day night after
Nothing stands out — every metric is within your normal variation on these days.
Deeper analysis — significance, timelines, dose-response & more
❤️ HRV
+2.5ms
65.7 vs 63.2ms
n=14 / 76
within your normal variation
HRV (ms)
▮ baseline   ▮ HRV days
💓 Resting HR
−0.7bpm
53.3 vs 54bpm
n=14 / 76
within your normal variation
Resting HR (bpm)
▮ baseline   ▮ Resting HR days
🛌 Sleep
+0.1h
7.1 vs 7h
n=14 / 76
within your normal variation
Sleep (h)
▮ baseline   ▮ Sleep days
1 metric unchanged on these days: Stress.
❤️ HRVavg 64 ms · latest 74 ms
50.2956.5762.8669.1475.42May 27Jun 18Jul 10Aug 1Aug 24
On your mention days: 66 ms · +2 vs baseline
Hide graph
❤️ HRV over time — orange = your mention days
When does it land? — Sleep Stress HRV Resting HR
The lighter bars are your baseline average (63.2ms ± 6.1 sd). Days from a day you mentioned it (0 = the day itself); where the HRV bar clears baseline is where the effect lands.
📔 Mood on the days you mentioned it
Mood coupling — does your mood track HRV on these days? (r=0.15, n=11)1234553.4958.8564.269.5674.92HRV (ms)Mood
Each dot is a mention day: that day's HRV vs the mood you logged.
Rhythm — when do these days fall? (longest run 2 days · typically every ~6 days)
Cohort days by weekday. A lopsided strip means the effect might be a weekday pattern — the stats above already switch to a weekday-matched baseline when that happens.
Exercise — do you train differently on these days?
You worked out on 14% of these days vs 17% otherwise — you train about as often as usual. Average 5.2 min vs 7.9 min per day.
From your Garmin activities — a possible confound for the biometric changes above.
Notable days — the most unusual cohort days, worth re-reading
2026-08-17 ↗ ❤️ HRV +11.3ms (1.2 sd from normal)
2026-08-14 ↗ 💓 Resting HR −3.4bpm (1.1 sd from normal)
2026-08-07 ↗ 😖 Stress +4.6 (1.0 sd from normal)
Opens that day in your journal — the numbers point you there; the words stay in your vault.
How this is computed
Your cohort is the days you mentioned coffee. Each metric's average on those days is compared with every other day in the window that has Garmin data (your baseline). The significance chip comes from a permutation test — 1,000 random reshuffles of which days are cohort days; a pattern is flagged only when the real difference beats most reshuffles (and you have at least 8 cohort days). "The night after" shifts the comparison to the following day. When your cohort clusters on certain weekdays, the baseline is restricted to those weekdays.
Correlations from your own logs — not causation. Mentioning or taking something once is easily noise at small n. Garmin daily rollups only; your journal prose never leaves your vault.
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