Sleep and Biological Rhythms

, Volume 16, Issue 2, pp 239–251 | Cite as

Sleep-related factors associated with industrial accidents among factory workers and sleep hygiene education intervention

  • Osamu Itani
  • Yoshitaka Kaneita
  • Maki Jike
  • Misaki Furuya
  • Chizuru Uezono
  • Fusako Oda
  • Ryuji Agematsu
  • Mikiko Tokiya
  • Yuichiro Otsuka
  • Takashi Ohida
Original Article


This study was conducted to investigate the association between industrial accidents and sleep-related parameters in factory workers, and to examine the effectiveness of sleep education intervention for improvement of sleep status. 714 factory workers were included in the study. A baseline survey was conducted using a self-administered questionnaire in December 2013. The questionnaire included items for the evaluation of sleep status (containing PSQI and ESS), sleep-related lifestyle habits, and experience of industrial accidents. In January 2014, workers were selected for a sleep education program that included attendance at a lecture and a take-home leaflet containing information on how to improve their sleep habits. All of the workers then participated in a follow-up survey in March 2014 to investigate the effectiveness of the education program. We first analyzed the association between industrial accidents and sleep status at the time of the baseline survey. Then, using data from the follow-up survey, we examined the effectiveness of sleep education by analyzing the differences in the improvement of sleep disorders and sleep habits between the groups who did and did not receive sleep education. We detected a significant association between the occurrence of industrial accidents and PSQI scores from the baseline survey. With regard to the effectiveness of the sleep hygiene education intervention, the percentage of early risers increased significantly in the intervention group among the participants less than 40 years of age. Among the participants aged 40 years or older, the percentage of those who did not drink an alcoholic beverage before going to sleep increased significantly in the intervention group.


Non-randomized controlled trials Good sleep habits Insomnia Circadian rhythm Occupational injuries Epidemiology 



This study was funded by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 25460816.

Compliance with ethical standards

Research involving human participants and/or animals


Conflict of interest

The authors have no conflict of interest to declare.


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Copyright information

© Japanese Society of Sleep Research 2018

Authors and Affiliations

  • Osamu Itani
    • 1
  • Yoshitaka Kaneita
    • 2
  • Maki Jike
    • 2
  • Misaki Furuya
    • 3
  • Chizuru Uezono
    • 4
  • Fusako Oda
    • 5
  • Ryuji Agematsu
    • 5
  • Mikiko Tokiya
    • 1
  • Yuichiro Otsuka
    • 2
  • Takashi Ohida
    • 2
  1. 1.Department of Public Health and Epidemiology, Faculty of MedicineOita UniversityYufuJapan
  2. 2.Division of Public Health, Department of Social Medicine, School of MedicineNihon UniversityTokyoJapan
  3. 3.Ijuin Public Health CenterHiokiJapan
  4. 4.Department of Health and WelfareKagoshimaJapan
  5. 5.Aira Public Health CenterKirishimaJapan

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