Accuracy of three commercial wearable devices for sleep tracking in healthy adults

This independent validation study from Brigham and Women’s Hospital and Harvard Medical School evaluated the sleep tracking accuracy of three consumer devices against gold-standard polysomnography (PSG). Monitoring 35 healthy adults during a single-night inpatient tracking trial, researchers analyzed epoch-by-epoch performance metrics for sleep-wake states and specific sleep stages.

While all tested hardware demonstrated 95% or greater sensitivity for identifying sleep, tracking accuracy for individual stages varied significantly across brands. The findings revealed that Oura Ring Gen3 demonstrated substantial agreement with PSG, performing as the only device with no statistically significant variance from the gold standard in estimating wake, light sleep, deep sleep, and REM sleep durations.