J Sleep Med.  2016 Dec;13(2):40-45. 10.13078/jsm.16008.

Subjective Sleep Disturbances of Factory Workers in Relation to Shift Work Schedule and Chronotype

• Song P
• Choi SJ
• Joo EY

• KMID: 2405601
• DOI: http://doi.org/10.13078/jsm.16008

Abstract

OBJECTIVES
Shift work in Korea is most prevalent in automobile system manufacturing industries. The subjective sleep complaints and individual chronotypes of shift worker was evaluated.
METHODS
A cross-sectional study was conducted among single automobile system manufacturing industries in Korea. All participants completed questionnaires about the work schedule, duration of sustained employment and various division of work. And sleep questionnaires including: Epworth Sleepiness Scale, Insomnia Severity Index, Hospital Anxiety and Depression Scale, and Morningness-Eveningness Questionnaire.
RESULTS
This study enrolled 208 participants [shift workers (SWs)=142, day workers (DWs)=66]. Insomnia symptoms were significantly worse in the SW group (p<0.001). Excessive daytime sleepiness was not significantly different between groups. The evening chronotype in DWs was related to both excessive daytime sleepiness (EDS) (p=0.008) and insomnia (p=0.034). On the other hand, chronotypes in SWs were not significantly different in terms of EDS and insomnia.
CONCLUSIONS
Insomnia symptoms were significant in SWs compare to DWs. In DWs the evening types were sleepier and had more insomnia symptoms than other chronotypes. The sleep symptoms are prevalent in automobile industries workers, and in part it is related to work schedule and individual chronotype.

Keyword

Shift work; Chronotype; Daytime sleepiness; Insomnia

MeSH Terms

Anxiety
Appointments and Schedules*
Automobiles
Cross-Sectional Studies
Depression
Employment
Hand
Korea
Sleep Initiation and Maintenance Disorders