Statistical analysis
All statistical analyses were performed using the Statistical Package for Social Sciences software (version 26.0; SPSS Inc., Chicago, IL, United States). For the three patient groups, demographic features, namely, age, weight, height, and BMI, were presented as means ± standard deviations and ranges, whereas gender, ASA class, and surgical complexity were presented as percentages. PSG sleep staging results are presented as mean ± standard deviation. Sleep patterns were assessed using the PSQI questionnaire, and the scores were calculated. Categorical data are presented as frequencies and percentages, and continuous data are presented as mean ± standard deviation.The 