Sleep and alertness in shift work disorder: findings of a field study

Source avec lien : International Archives of Occupational and Environmental Health, 92(4), 5/1/2019. 10.1007/s00420-018-1386-4

Bien que les troubles du sommeil dûs travail posté (en anglais Shift work disorder ou SWD) affectent une grande partie de la population des travailleurs postés, on en sait peu sur sa manifestation dans la vie réelle. Cette étude de terrain d’observation visait à fournir une image détaillée du sommeil et de la vigilance chez les travailleurs postés souffrant du SWD (selon un questionnaire), en les comparant aux travailleurs postés sans SWD pendant les quarts de travail et les temps libres.

PurposeAlthough shift work disorder (SWD) affects a major part of the shift working population, little is known about its manifestation in real life. This observational field study aimed to provide a detailed picture of sleep and alertness among shift workers with a questionnaire-based SWD, by comparing them to shift workers without SWD during work shifts and free time.MethodsSWD was determined by a questionnaire. Questionnaires and 3-week field monitoring, including sleep diaries, actigraphy, the Karolinska Sleepiness Scale (KSS), EEG-based sleep recordings, and Psychomotor Vigilance Tasks (PVT), were used to study 22 SWD cases and 9 non-SWD workers.ResultsThe SWD group had a shorter subjective total sleep time and greater sleep debt before morning shifts than the non-SWD group. Unlike the non-SWD group, the SWD group showed little compensatory sleep on days off. The SWD group had lower objective sleep efficiency and longer sleep latency on most days, and reported poorer relaxation at bedtime and sleep quality across all days than the non-SWD group. The SWD group’s average KSS-sleepiness was higher than the non-SWD group’s sleepiness at the beginning and end of morning shifts and at the end of night shifts. The SWD group also had more lapses in PVT at the beginning of night shifts than the non-SWD group.ConclusionsThe results indicate that SWD is related to disturbed sleep and alertness in association with both morning and night shifts, and to less compensatory sleep on days off. SWD seems to particularly associate with the quality of sleep.

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