Do holidays change subjective sleep length or sleep debt in shift work disorder?

Feb 17, 2022Industrial health

Do holidays change how people with shift work disorder feel about their sleep amount or sleep loss?

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Abstract

Shift workers with disturbed sleep reported a median difference of 1.7 hours less sleep on workdays compared to holidays.

Both shift workers with sleep work disorder (SWD) and reference cases reported shorter sleep on workdays than during holidays.
The SWD group's self-estimated sleep increased by a median of 0.0 hours during holidays, compared to 1.0 hours for the reference group.
Only 14% of the SWD group reported good recovery from irregular working hours, in contrast to 100% of the reference group.
Holidays were generally linked to longer sleep estimates, but those with SWD showed consistently less effective recovery than those without SWD.

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In shift work disorder (SWD), disturbed sleep acutely impairs employees' recovery, but little attention has been paid to sleep during longer recovery periods. We examined how holidays affect self-estimated sleep length, sleep debt, and recovery in cases of SWD. Twenty-one shift workers with questionnaire-based SWD and nine reference cases without SWD symptoms completed a questionnaire on recovery and sleep need. They also reported sleep length on two separate occasions: during a work period and after ≥ 2 weeks of holidays. Sleep debt was calculated by subtracting sleep length from sleep need. We used parametric tests to compare the groups and the periods. The groups reported shorter sleep on workdays than during holidays (median difference: SWD group 1.7 h, p<0.001; reference group 1.5 h; p<0.05). The SWD group's self-estimated sleep during holidays increased less above the sleep need (median 0.0 h) than the reference group's sleep (1.0 h, p<0.05). In addition, the SWD group reported good recovery from irregular working hours less often (14%) than the reference group (100%, p<0.001). Although holidays were generally associated with longer sleep estimates than workdays, employees with SWD experienced consistently less efficient recovery than those without SWD.

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Do holidays change subjective sleep length or sleep debt in shift work disorder?

Abstract

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