Fig. 1

Flow diagram SCHIP study. Abbreviations: PSQI, Pittsburgh Sleep Quality Index; CFQ, Cognitive Failure Questionnaire; HADS, Hospital Anxiety and Depression Scale; TAP, Test of Attentional Performance; RBD, REM sleep behavior disorder; PSG, polysomnography. Superscript letter “a” indicates that over the course of the study, four maritime pilots went into retirement; therefore, analysis for the work days is based on the remaining, employed maritime pilots (n = 13)