Lai CC, et al. - Experts assessed the impact of upper airway surgery on daytime sleepiness in non-obese patients with obstructive sleep apnea/hypopnea syndrome (OSA) in this retrospective study. Participants were recruited from a tertiary academic medical center and included 121 consecutive adults with OSA who refused continuous positive airway pressure therapy (or in whom it was unsuccessful) and then underwent OSA surgery. Participants were classified into three OSA groups: mild, moderate, severe. Researchers observed statically significant improvements in snoring index in all three OSA groups, and observed statistically significant decreases in apnea/hypopnea index in the moderate and severe OSA groups. Findings suggested that daytime sleepiness may be improved by the OSA surgery in nonobese patients with OSA, especially patients with severe OSA.