INTRODUCTION: Polysomnography is the cornerstone in the evaluation of sleep disorders. However, this technique has several drawbacks: cost, long time of realization and availability. The connected bracelet could be the main alternative because of its ease of use and low cost.

OBJECTIVE:  To compare the accuracy of sleep assessment between the connected bracelet versus Polysomnography (PSG).

MATERIALS AND METHODS:  A series of 20 patients was collated. Data from the connected bracelets and PSG were collected simultaneously during a nightly recording at the sleep medicine center at the CHU Hassan II Fez. Results: The mean age was: 50 years, women represented 50% of the series. The results obtained by the connected bracelet and by PSG show a concordance of the evaluation of REM sleep (average difference of 2%). PSG overestimated the number of awakenings compared to the connected bracelet, which is in line with the majority of the data in the literature. There was satisfactory agreement in the assessment of total sleep time between PSG and the connected bracelet with a mean difference of up to 60 minutes. The mean differences in deep sleep did not exceed 10%.

CONCLUSION: Based on these results, it can be concluded that the connected bracelet shows agreement with PSG in the measurement of REM and deep sleep. These devices could be an alternative to PSG in the future.