Automatic sleep stage classification for sleep apnea patients using an in-home sleep electroencephalography device

Saki Tsumoto, Jaehoon Seol, Kazumasa Horie, Fusae Kawana, Morie Tominaga, Shigeru Chiba, Hideaki Kondo, Hiroyuki Yoshimine, Masaki Matsubara, Atsuyuki Morishima, Masashi Yanagisawa, Hiroyuki Kitagawa

Abstract: With the rising awareness of the critical role sleep plays in both health and social well-being, the demand for sleep studies is rapidly increasing.Automatic sleep stage classification is a fundamental part of sleep measurement, and machine learning models have been developed to assist in this process. These models achieve accuracy comparable to that of technicians when using data from healthy individuals. However, sleep patterns in individuals with sleep disorders, such as sleep apnea syndrome (SAS), one of the most common sleep disorders, differ from those of healthy individuals. As a result, existing models trained on healthy individuals’ data do not achieve sufficient accuracy when applied to SAS patients. This is a barrier to clinical application.A recent study using in-home EEG devices showed that technicians can accurately classify sleep stages in SAS cases by considering surrounding epochs. Based on this, we developed a model dedicated to SAS patients that incorporates the temporal context of relevant epochs.We found that this context-aware model significantly improved classification accuracy compared to models that only focused on the target epoch. In the training process using data from 76 severe SAS cases, the model based solely on single-epoch data achieved an accuracy of 71.5%, while the model considering the surrounding epochs achieved an accuracy of 73.7%. The classification accuracy improved across all stages except N3.This approach appears to capture the frequent sleep stage transitions characteristic of SAS.