Performance of seven consumer sleep-tracking devices compared with polysomnography.

Sleep · 2021 · PMC8120339 · PMID 33378539

Europe PMC DOI

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a nonsignificant trendno p-value reported

There was a nonsignificant trend for EarlySense Live to underestimate REM latency, while the other five devices all significantly overestimated REM latency.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.