This study investigated the association between work stress and sleep disturbance among Korean workers, focusing on the mediating effects of somatic and cognitive pre-sleep arousal symptoms. Data were derived from the "Korean Work, Sleep, and Health Study (KWSHS)," involving 4,393 participants. Work stress was assessed using the Korean Occupational Stress Scale, and sleep disturbances were measured using the Insomnia Severity Index and Pittsburgh Sleep Quality Index. The Pre-Sleep Arousal Scale was utilized for assessing pre-sleep arousal status. For statistical analyses, the χ