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Background and Objectives: Although there are many stages of sleep, there are few studies on the differences in snoring sounds that occur in each stage of sleep. Acoustic analysis of snoring sounds provides a lot of information, and in this study, we attempted to acoustically analyze and compare snoring sounds generated during rapid eye movement (REM) sleep and non-REM (NREM) sleep. Materials and Methods: Thirteen with obstructive sleep apnea who underwent polysomnography were enrolled. Snoring sounds were analyzed during REM and NREM (N2 stage) sleep using a recorder placed within 30 cm of the shoulders. To eliminate confounding factors associated with sleeping position, the snoring sounds were recorded only in the supine position. In addition, to prevent inter-examiner errors, the recordings were performed by a single person. Snoring sounds were compared between sleep stages for formant frequency (Hz), intensity (dB), and spectrogram. Results: Formant frequency analysis of snoring sounds revealed statistically significant F2 values generated during REM and NREM (N2) sleep in males (p<0.05). The intensity of snoring sounds (dB) was significantly higher in men than in women during REM sleep (p<0.05). A 0.025-narrow-band spectrogram analysis revealed that the intensity waveform of snoring was darker and exhibited higher energy densities in REM sleep than in NREM (N2) sleep. Conclusion: There was an acoustic difference between the snoring sound generated during REM sleep and NREM (N2) sleep, and further studies with more cases should be conducted.
