O015 Measuring Body Movements during Sleep. Sonomat Vs Video Polysomnography

Background Restless sleep is common in children, and video polysomnography (vPSG) has been used to score body movements during sleep. The Sonomat provides a contactless, portable alternative for home sleep studies over several nights. This study aimed to compare body movements measured by the Sonomat with those scored using vPSG. Methods Twenty-nine children (13 females, 16 males) with a median age of 5.4 years underwent concurrent Sonomat and vPSG studies. Movement indices per hour of sleep period and movement duration (%) were blindly scored on separate days. Statistical analysis included the Wilcoxon rank test and Pearson's correlations. Results Movement indices were higher on the Sonomat than vPSG (median 38.6/hr vs. 22.7/hr, p < 0.001), but movement duration did not differ (median 10.8% vs. 10.5%, p = 0.092). Comparing movements above 5 seconds, the indices became more comparable (15.9/hr vs. 19.2/hr, p = 0.05). The correlation between devices was weak for movement indices (r = 0.37, p = 0.051) but strong for movement duration (r = 0.81, p < 0.001). The Sonomat identified 82.5% of movements seen on vPSG, while vPSG identified only 43.6% of those on the Sonomat. Conclusion The Sonomat offers a contactless and portable alternative to vPSG for assessing body movements during sleep in children. It exhibited higher sensitivity in detecting shorter movements and was comparable to vPSG in movement duration. These findings suggest that the Sonomat holds promise for evaluating restless sleep in children.