title: Correlation between shift-work-related sleep problems and heavy drinking in Japanese male factory workers.
abstract: OBJECTIVE
  To investigate the effects of shift work on increased alcohol intake associated with poor sleep quality.
  
  
  METHODS
  This cross-sectional survey evaluated the correlation between work schedule, poor sleep quality and heavy drinking among 909 factory workers aged 35-54 years in Japan. Subjects included 530 day workers, 72 shift workers who did not work at night and 290 shift workers who engaged in night work. Heavy drinking was defined as a mean volume of alcohol consumption exceeding 60 g/day.
  
  
  RESULTS
  Compared with other workers, night-shift workers who suffered poor sleep quality exhibited the highest frequency of heavy drinking (17.6%). Multiple logistic regression analysis demonstrated that compared with day workers with good sleep, night-shift workers who experienced poor sleep had more than twice the odds of heavy alcohol consumption (odds ratio 2.17 [95% confidence interval (CI), 1.20-3.93]). Shift workers who did not work at night and day workers with poor sleep were not at increased odds of heavy drinking.
  
  
  CONCLUSIONS
  Shift workers who engage in night work may try to modify their health behavior to cope with sleep problems. Such modification may be a risk factor for heavy drinking.
authors.affiliation: Department of Epidemiology and Public Health, Kanazawa Medical University, Ishikawa, Japan. ymjr@kanazawa-med.ac.jp
authors.forename: Yuko
authors.initials: Y
authors.lastname: Morikawa
authors.forename: Masaru
authors.initials: M
authors.lastname: Sakurai
authors.forename: Koshi
authors.initials: K
authors.lastname: Nakamura
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Nagasawa
authors.forename: Masao
authors.initials: M
authors.lastname: Ishizaki
authors.forename: Teruhiko
authors.initials: T
authors.lastname: Kido
authors.forename: Yuchi
authors.initials: Y
authors.lastname: Naruse
authors.forename: Hideaki
authors.initials: H
authors.lastname: Nakagawa
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000208:ethnology* / Q000503:physiopathology; D044466:Asian People / Q000208:ethnology*; D003430:Cross-Sectional Studies; D006801:Humans; D007221:Industry; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D020178:Sleep Disorders, Circadian Rhythm / Q000175:diagnosis* / Q000208:ethnology* / Q000503:physiopathology; D014940:Work Schedule Tolerance / Q000502:physiology