0249 Individual differences of sleep pattern and duration between two consecutive night shifts among night workers

Abstract Introduction Working at night leads to shortened and disturbed daytime sleep. Night workers usually adopt one of several sleep patterns between consecutive nights: sleeping right after work (morning sleep), delaying the afternoon (afternoon or dividing into two more episodes (split sleep). However, few studies have examined pattern duration nights in real-world workers. The objective this study was examine individual differences when working shifts. Methods (n=241, 43.0±16.5y, 67.2% female) from various occupations who reported completed an online survey. survey included questions on socio-demographics nap schedules. Sleep vs. split) total time (sleep+naps) were derived responses. Cross-tabulations ANOVA conducted. Results On average, a 5.37±2.69 hours (range 0-14.25 hours). 65.1% morning sleep, 10% 24.9% split Split sleepers (6.78±2.13 hours) longer than (4.86±2.75 (5.11±2.37 sleepers. Younger age (< 50y), single marital status, shorter shift tenure (≤10 years), ≤3 shifts, having ill disabled dependents associated with greater prevalence sleep; older (≥50y), married separated/widowed, >10 years tenure, ≥4 no Having childcare responsibility children. Similarly, younger singles, three fewer dependents, second job Conclusion timing influenced by age, number Future are needed explore what is most beneficial for performance, safety, health outcomes these Support (if any) supported grant R01 AG044416 US National Institutes Health.