Occupational and psychosocial correlates of sleep disturbance among Chinese expatriate employees in Iraq’s Maysan oilfields: a cross-sectional study using regression and network analysis

IntroductionChinese expatriate oilfield employees working in Iraq are exposed to multiple occupational and psychosocial stressors, yet evidence on sleep disturbance and its correlates in this workforce remains limited.MethodsA cross-sectional survey was conducted among 917 employees. 826 (90.1%) were included after excluding incomplete or invalid responses. Sleep quality and related concern was assessed using the Pittsburgh Sleep Quality Index (PSQI) and the second item of the General Health Que