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Sleep Disorders
Volume 2014, Article ID 870320, 5 pages
Research Article

Prevalence of Sleep Disorders and Their Impacts on Occupational Performance: A Comparison between Shift Workers and Nonshift Workers

1Metabolic Disease Research Center, Qazvin University of Medical Sciences, Qazvin 34139-8-3731, Iran
2Occupational Sleep Research Center, Tehran University of Medical Sciences, Tehran 5583-1-4155, Iran
3Department of Occupational Medicine, Industrial Diseases Research Center, Shahid Sadoughi University of Medical Sciences, Yazd 89151-7-3143, Iran
4Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Qazvin 34139-8-3731, Iran

Received 25 January 2014; Accepted 7 May 2014; Published 20 May 2014

Academic Editor: Liborio Parrino

Copyright © 2014 Zohreh Yazdi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The consequences of sleep deprivation and sleepiness have been noted as the most important health problem in our modern society among shift workers. The objective of this study was to investigate the prevalence of sleep disorders and their possible effects on work performance in two groups of Iranian shift workers and nonshift workers. This study was designed as a cross-sectional study. The data were collected by PSQI, Berlin questionnaire, Epworth Sleepiness Scale, Insomnia Severity Index, and RLS Questionnaire. Occupational impact of different sleep disorders was detected by Occupational Impact of Sleep Disorder questionnaire. These questionnaires were filled in by 210 shift workers and 204 nonshift workers. There was no significant difference in the age, BMI, marital status, and years of employment in the two groups. Shift workers scored significantly higher in the OISD. The prevalence of insomnia, poor sleep quality, and daytime sleepiness was significantly higher in shift workers. Correlations between OISD scores and insomnia, sleep quality, and daytime sleepiness were significant. We concluded that sleep disorders should receive more attention as a robust indicator of work limitation.