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Sleep Inertia and Its Associates in Shift and Non-Shift Workers
Juseung Kang1, Jichul Kim1, Jooyoung Lee2
1Department of Psychiatry, Sungkyunkwan University College of Medicine, Samsung Medical Center, Seoul, Republic of Korea.
Psychiatry Investigation
|August 1, 2024
Summary
Shift workers experience greater sleep inertia than non-shift workers. Depressive symptoms and chronotype significantly impact sleep inertia, with varying effects based on work schedules and sleepiness.
Area of Science:
- Sleep Medicine
- Occupational Health
- Psychology
Background:
- Shift work is associated with various health issues, including disrupted sleep patterns.
- Sleep inertia, the transient cognitive impairment experienced upon waking, is a significant concern for worker performance and safety.
Purpose of the Study:
- To compare sleep inertia between shift workers (SWs) and non-shift workers (NSWs).
- To investigate the influence of depressive symptoms, sleepiness, insomnia, and chronotype on sleep inertia in both groups.
Main Methods:
- A large-scale online survey involving 4,561 SWs and 2,093 NSWs.
- Utilized validated questionnaires: Sleep Inertia Questionnaire (SIQ), CESD, ESS, ISI, and MEQ.
Main Results:
- Shift workers reported significantly higher sleep inertia (SIQ scores) than non-shift workers, even after controlling for other factors.
- Depressive symptoms (CESD) and chronotype (MEQ) were significant predictors of sleep inertia in both groups.
- The influence of depressive symptoms on sleep inertia was more pronounced in SWs, while chronotype's effect was stronger in NSWs.
Conclusions:
- Shift work is linked to increased sleep inertia.
- Depressive symptoms and chronotype play distinct roles in sleep inertia for shift and non-shift workers.
- Sleepiness mediates the relationship between depressive symptoms/chronotype and sleep inertia, with work schedules significantly moderating these indirect effects.
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