Every stat below is 2026 only (Jan 1 → 2026-10-08). The centerpiece is a month-over-month matrix — each cell shows that month's value and its change vs the prior month (Feb vs Jan, Mar vs Feb, …). Below it: night HR, HRV, REM and the HRV × REM × quality test, all rescoped to 2026.
Rows = metrics, columns = months of 2026. Each cell shows the month's value with the change vs the previous month beneath it — green ▲ = improved, red ▼ = declined (judged by each metric's "better" direction). January has no prior month. Scroll horizontally for later months.
▲ green = better than last month▼ red = worse than last month• grey = no changePartial months (Oct) cover fewer days.
Change vs previous month
Pick a metric — bars show each month's delta against the month before, colored by whether it moved in the good direction.
Per-minute overnight HR across 262 nights in 2026. Spikes that occur while you're moving (activity ≠ sedentary, elevated intensity, or steps) are excluded — only genuine resting surges count.
The average 2026 night, aligned to sleep onset
Mean HR at each point after falling asleep (all 262 nights). Lowest ~4–5h in, then a steep climb into wake.
When resting spikes happen
By hours into the night — clustered in the final third.
By clock hour (Pacific)
The pre-dawn 4–5am surge dominates.
A real 2026 night, minute by minute
2026-03-09 — the most spike-active night (11 resting spikes). Dotted line = that night's spike threshold.
Nightly HRV (SDNN-style, ms) for every tracked night in 2026, with your personal Garmin baseline band. A "tank" = a night below your baseline lower limit.
Nightly HRV vs your baseline
Purple line = HRV; shaded band = your Garmin baseline range; red ▼ = tanked nights.
Monthly median HRV, 2026
Median HRV per month — the longer arc beneath the nightly noise.
Every HRV tank night in 2026
A tank = HRV below your personal Garmin baseline lower limit.
Every 2026 night's REM minutes and its share of total sleep, plus the 7-day moving average across the year to date. Healthy REM is ~20–25% of the night.
REM: nightly (faint) vs 7-day moving average (bold)
Dashed line = 60-min reference. Hover for exact values.
REM minutes per night
Bars = REM minutes; line = REM as % of total sleep; dashed bands = 20% / 25% healthy targets.
Every 2026 night
Scrollable day-by-day table. Red = under 60 min REM; green = 90+ min.
2026-01-01 → 2026-10-08 · 278 nights with HRV in 2026. Does a low-HRV / low-REM night really mean the worst sleep? The data below tests it directly.
HRV over 2026
Nightly HRV with tanks (red ▼). Flat, not falling.
REM vs sleep score
REM bars track the sleep-score line almost perfectly — this is what drives your quality.
HRV vs sleep score
Each dot = one night. Flat cloud → HRV barely moves your sleep score.
REM vs sleep score
Each dot = one night. Tight upward slope → REM is the real driver.
The decisive test: sleep score by HRV × REM quadrant
2026 nights split by whether HRV and REM were above/below their median. If the theory held, "low HRV + low REM" would be far worse than the rest — instead only REM moves the needle.