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What does my Apple Watch data look like?
6 years of two Apple Watches' nights and days: how much there is, what is typical, how it has moved, and where the last month sits.
Client name: George · Apple Watch · 2020-10-01 → 2026-09-28
Answer to the presenting question
1,477 nights over 6.0 years, a reading on 67% of them.
- Lately, all 8 headline measures sit within their usual range.
- A typical night: asleep around 22:30, awake around 05:57, 6.98 h asleep; overnight HRV 41 ms, breathing 12.5 a minute. Resting heart rate 62 bpm; walking heart rate 99 bpm.
- 'Usual' is the middle half (25th–75th percentile) of 2025-08-30 → 2026-08-29; 'lately' is 2026-08-30 → 2026-09-28, shaded on the charts. A description of where the last month sits, not a test.
Descriptive, not a test: what the data are, not what caused them.
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Two watches: the first to 2024-09-13, the second from then. Breaks of two weeks or more with no sleep recorded: 2020-10-05 → 2022-09-12 (708 nights). 0 shorter breaks of three nights or more are not listed.
Look at any measure
Monthly medians for this measure
How this chart was derived
Sleep
Each night is dated by the evening it began.
Overnight
Readings taken between midnight and 8 am, drawn on the evening before. The watch changed on 2024-09-13; the series runs on across it.
Days
Fitness estimate
A model output rather than a measurement: useful for its direction over months.
By year
Median of the days that year; small number: days with a reading. Hover a cell for the middle half.
| 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | |
|---|---|---|---|---|---|---|---|
| Time asleep h | 6.564 | — | 7.24109 | 7.14364 | 7.19366 | 7.01363 | 6.26271 |
| Fell asleep | 22:014 | — | 22:20109 | 22:27364 | 22:16366 | 22:28363 | 23:05271 |
| Woke | 05:104 | — | 05:53109 | 05:57364 | 05:52366 | 05:59363 | 05:59271 |
| Deep sleep h | — | — | 0.64109 | 0.70364 | 0.68365 | 0.70363 | 0.69268 |
| REM sleep h | — | — | 1.53109 | 1.63364 | 1.62365 | 1.52363 | 1.43268 |
| Awake during the night h | — | — | 0.32109 | 0.28364 | 0.29364 | 0.35363 | 0.40270 |
| Overnight HRV (SDNN) ms | 4392 | 45364 | 41365 | 39364 | 43366 | 38365 | 37271 |
| Breathing rate asleep breaths/min | — | 13.0102 | 13.0365 | 13.0364 | 12.5366 | 12.5364 | 12.5270 |
| Blood oxygen (SpO2) overnight % | — | — | — | — | 94.0109 | 94.0364 | 95.0270 |
| Wrist temperature asleep °C | — | — | — | — | 35.40109 | 35.29361 | 35.08258 |
| Resting heart rate bpm | 5793 | 54365 | 57365 | 63364 | 64365 | 67365 | 66271 |
| Walking heart rate bpm | 9989 | 98345 | 99357 | 101362 | 100358 | 100350 | 98263 |
| Cardio fitness (VO2 max) ml/kg/min | 37.015 | 34.120 | 34.948 | 33.7106 | 32.164 | 31.853 | 32.237 |
By day of the week
Median over every such day in the record. Bold: that measure's highest day; grey: its lowest. For night measures the day is the evening the night began, so "Fri" is Friday night.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | |
|---|---|---|---|---|---|---|---|
| Fell asleep | 22:16 | 22:29 | 22:27 | 22:24 | 23:03 | 22:40 | 22:15 |
| Woke | 05:25 | 05:45 | 05:07 | 05:53 | 07:16 | 07:52 | 05:07 |
| Time asleep h | 6.80 | 6.78 | 6.46 | 6.92 | 7.40 | 8.63 | 6.74 |
| Overnight HRV (SDNN) ms | 41 | 41 | 39 | 40 | 42 | 42 | 42 |
| Resting heart rate bpm | 63 | 63 | 63 | 63 | 63 | 59 | 59 |
What the prose above is checked against
Each is computed at build time. One that fails stops the build rather than leave a sentence standing that the data no longer support.
- nights are dated by the evening they began: against his Withings sleep mat on 366 shared nights, time asleep correlates r = 0.91 on the same night and 0.11 / 0.09 one night either side; bedtime 0.92, against 0.17 / 0.15
- no day is drawn for 2026-09-29, the export's own date and a day still in progress
- wrist temperature appears only on the second watch: 0 readings before 2024-09-13
- every headline measure has enough nights to judge 'lately' (8 of 8)
Sources and derivation
- Apple Health export, made September 29, 2026. Only records written by his Apple Watch are used; apps that copy into Apple Health (sleep trackers, HRV apps) are left out, so each number has one source.
- Times are read as his local clock, as Apple writes them. A night belongs to the evening it began; overnight readings between midnight and 8 am sit on the evening before.
- Sleep stages exist only from late 2022, when the Watch began to estimate them; before that, deep and REM sleep are blank, not zero.
- September 29, the day of the export, is left out as a day still in progress.
- Every value on this page is in
tidy.csvbeside it.
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