Q: Is Garmin CIRQA's sleep data accurate?

It’s broadly reliable for total sleep duration and physiological metrics like resting heart rate and breathing rate. Its breakdown of sleep into REM, deep and light stages shows no consistent agreement with other trackers, which is typical of wrist-worn consumer devices.

Q: What does CIRQA's restorative sleep figure actually measure?

It’s CIRQA’s own deep sleep total added to its own REM total, matching exactly on every night in this dataset. It isn’t a separately measured stage, so it inherits whatever bias sits in CIRQA’s deep and REM numbers.

Q: Can CIRQA's sleep score be compared with scores from other brands?

Not directly. CIRQA’s score averaged 14 points higher than Eight Sleep’s over the same nights. Each brand runs its own scoring formula, so absolute scores aren’t interchangeable across devices, even when both claim a 0 to 100 scale.

Q: Does wearing Whoop on the bicep instead of the wrist affect this comparison?

It’s a plausible factor. Whoop was worn on the bicep in this dataset, a different measurement site from the four wrist-worn devices, which could explain some of its disagreement with the group independent of any difference in the algorithm.

Question 1

Is Garmin CIRQA's sleep data accurate?

Accepted Answer

It&#8217;s broadly reliable for total sleep duration and physiological metrics like resting heart rate and breathing rate. Its breakdown of sleep into REM, deep and light stages shows no consistent agreement with other trackers, which is typical of wrist-worn consumer devices.

Question 2

Why is Eight Sleep used as the main comparison device?

Accepted Answer

Eight Sleep measures from underneath the mattress rather than from a wrist sensor, which gives a more continuous physiological signal. That&#8217;s a reasonable basis for using it as a comparison point, but its own sleep-stage algorithm hasn&#8217;t been checked against a lab reference either.

Question 3

Does CIRQA overestimate REM sleep?

Accepted Answer

Compared with Eight Sleep, CIRQA reports more REM sleep on 12 of 14 usable nights, by 48 minutes on average. The data can&#8217;t say which device is closer to the truth, only that they disagree consistently in one direction.

Question 4

Does CIRQA underreport time spent awake?

Accepted Answer

Yes, relative to Eight Sleep. CIRQA logged less awake time on 12 of 14 usable nights, by 42 minutes on average, and by over an hour on several nights.

Question 5

What does CIRQA's restorative sleep figure actually measure?

Accepted Answer

It&#8217;s CIRQA&#8217;s own deep sleep total added to its own REM total, matching exactly on every night in this dataset. It isn&#8217;t a separately measured stage, so it inherits whatever bias sits in CIRQA&#8217;s deep and REM numbers.

Question 6

Can CIRQA's sleep score be compared with scores from other brands?

Accepted Answer

Not directly. CIRQA&#8217;s score averaged 14 points higher than Eight Sleep&#8217;s over the same nights. Each brand runs its own scoring formula, so absolute scores aren&#8217;t interchangeable across devices, even when both claim a 0 to 100 scale.

Question 7

Is CIRQA's HRV reading comparable to other wearables?

Accepted Answer

Not as an absolute number. CIRQA reads higher than Eight Sleep on every usable night and higher than Whoop on all but one. The consistent direction of the gap points to a difference in calculation rather than physiology, so CIRQA&#8217;s HRV is best used to track your own trend rather than compared against another brand&#8217;s figure.

Question 8

Why does Whoop report one combined restorative figure instead of separate deep and REM numbers?

Accepted Answer

Whoop reports a single restorative total rather than splitting out light, deep and REM sleep. Light sleep is generally the stage hardest to detect reliably from a wrist or bicep sensor, so combining deep and REM into one number sidesteps that weak point rather than solving it.

Question 9

Does wearing Whoop on the bicep instead of the wrist affect this comparison?

Accepted Answer

It&#8217;s a plausible factor. Whoop was worn on the bicep in this dataset, a different measurement site from the four wrist-worn devices, which could explain some of its disagreement with the group independent of any difference in the algorithm.

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