목적: In the AI model’s hypnodensity, the wake-stage probability decreases in deeper sleep stages and shows a strong linear correlation with arousability, defined as the probability of an arousal or awakening in the next 30-second epoch. By comparing each individual’s average arousability throughout the night with Apnea- Hypopnea Index (AHI) values, this study explores whether deeper sleep relates to sleep apnea severity. 방법:Data were obtained from a labeled dataset (1,492 nights, 2013–2024) containing Polysomnography (PSG) annotations and sound recordings captured by PSG or smartphone microphones, and an unlabeled dataset (23,584 nights, 2022–2023) with only sound recordings collected through the consumer sleep tracking service Sleep Routine. Wake probability values were divided into 20 intervals to calculate arousability per interval, and these epoch-level estimates were averaged across each session. Correlation analyses were performed to assess the relationship between AHI (both actual and estimated) and average arousability. 결과:In the labeled dataset, the mean actual and estimated AHI were 21.9 (SD = 21.2) and 20.8 (SD = 20.7), respectively, with a correlation coefficient of 0.96 (p = 0.135). Arousability ranged from 0.056 to 0.755 (mean = 0.21, SD = 0.09). Correlations between arousability and actual AHI (r = 0.078) and between arousability and estimated AHI (r = 0.044) were both low. In the unlabeled dataset, the mean estimated AHI was 2.22 (SD = 6.59), and arousability ranged from 0.024 to 0.987 (mean = 0.14, SD = 0.07), yielding a correlation coefficient of 0.009. 결론:These findings suggest no strong correlation between hypnodensity- based arousability, tentatively viewed as a proxy for sleep depth, and sleep apnea severity as measured by AHI. Additional research is needed to validate arousability as an indicator of sleep depth, and more comprehensive demographic data and advanced statistical methods could offer deeper insights into the relationship.