The National Research Centre for the Working Environment, 2100 Copenhagen, Denmark.
Finnish Institute of Occupational Health, 00032 Helsinki, Finland.
Int J Environ Res Public Health. 2022 Aug 24;19(17):10527. doi: 10.3390/ijerph191710527.
Night shift work often implies shorter sleep duration and this can lead to sleepiness, which has been associated with an increased risk of accidents and injuries. The aim is to study how the number of consecutive night shifts affects self-reported sleepiness.
The study was a quasi-experimental, within-subject crossover study with 73 police officers. Three work schedules of two, four, and seven consecutive night shifts followed by the same number of recovery days, i.e., days worked or days off, was performed by all participants. Sleepiness was self-reported using the Karolinska sleepiness scale (KSS) every fourth hour on the last night shift and the last recovery day in each sequence.
We observed differences in the level of sleepiness between recovery days and night shift days but no differences in the pattern of sleepiness levels on night shift days in the different work schedules. The highest levels of KSS were observed before bedtime (at 07:00 after a night shift and 23:00 on a recovery day).
The number of consecutive night shifts did not affect the self-reported levels of self-reported sleepiness among Danish police officers.
夜班工作通常意味着睡眠时间更短，这可能导致困倦，而困倦与事故和受伤风险增加有关。本研究旨在探讨连续夜班的数量如何影响自我报告的困倦程度。
这是一项准实验性、个体内交叉研究，共有 73 名警察参与。所有参与者都执行了三种工作时间表，包括两个、四个和七个连续的夜班，然后是相同数量的恢复日，即工作日或休息日。最后一个夜班和每个序列中的最后一个恢复日，每四个小时使用 Karolinska 困倦量表（KSS）自我报告困倦程度。
我们观察到恢复日和夜班之间的困倦程度存在差异，但在不同工作时间表的夜班期间，困倦程度模式没有差异。KSS 的最高水平出现在睡前（夜班后 07:00 和恢复日 23:00）。
丹麦警察连续夜班的数量不会影响自我报告的困倦程度。
