Sleepiness of day workers and watchkeepers on board at high seas: a cross-sectional study

Objectives To estimate the prevalence of sleepiness on duty among day workers and watchkeepers on board. Design Cross-sectional survey in a maritime field study. Setting 10 shipping companies with container vessels under German management. Participants The whole crew (75 day workers and 123 watchkeepers) during 18 voyages on 18 different container ships. Outcome measures Sleepiness on duty and efficiency of sleep using pupillometry (in a...