Chronotype-specific Sleep in Two Versus Four Consecutive Shifts

The study aimed to explore chronotype-specific effects of two versus four consecutive morning or night shifts on sleep-wake behavior. Sleep debt and social jetlag (a behavioral proxy circadian misalignment) were estimated from sleep diary data collected for 5 weeks in a within-subject field 30 rotating shift workers (29.9 ± 7.3 years, 60% female). Mixed models used examine whether sequence length are dependent chronotype, testing the interaction between (two vs. four) chronotype (determined diaries). Analyses showed no significant with chronotype. In contrast, increasing number increased early chronotypes, but decreased late types, change intermediate ones. higher was due accumulated loss over shifts. duration did not increase course shifts, so that adaptation is unlikely explain observed lower debt. Late types instead had after which carried preceding this schedule. Including naps findings. Social unaffected by Our results suggest should be limited types. For other working might beneficial alternative Studies record sequences schedules.