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"Performance of seven consumer sleep-tracking devices compared with polysomnography" Sleep. 2021 May PMC8120339

Seems to accurately analyze them. Conclusion "Device sleep stage assessments were inconsistent."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8120339/

This research was funded by the Office of Naval Research, Code 34. (see also Disclosure Statement)

From the study: "Most devices (Fatigue Science Readiband, Fitbit Alta HR, EarlySense Live, ResMed S+, SleepScore Max) performed as well as or better than actigraphy on sleep/wake performance measures".

Great news.

Yes, the study evaluates the accuracy, and the results are not good!

The Garmin one is discontinued.

Also, is there a more "layman readable" version of this paper/report?

The Garmin watches have been replaced by newer versions with upgraded sensors. Garmin's tracking isn't perfect, but each version has made small improvements.

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