Background
: The accuracy and efficiency of a job performed by hospital employee can be linked directly with patients' health and life. It is considered that their irregular work and stress are relatively high as compared with other workplaces. In this article we tried to look into how job stress, working environment and factors of life- style influence sleep problems in hospital employees.

Methods : This research was conducted among 248 workers of a hospital in Busan on April, 2002. Sleep problems were categorized into insomnia, sleep deprivation, daytime sleepiness and snoring on the basis of the factor analysis of 11-item questions. The job stress was proposed by Karasek, etc., and measured by 14-item modified questions. The statistical analysis was conducted using Chi-square test and multiple logistic regression analysis.

Results : Statistically insomnia, sleep deprivation and daytime sleepiness showed a significant increase in women (OR:2.1/2.69/3.16) and shift workers (OR:4.67/ 3.28/1.98) and snoring showed a significant increase in obesity (OR:5.0) and smokers (OR:2.34).

Conclusion : This research showed that many hospital employees perceive sleep disorders as critical. Especially, work shift seemed to be an important risk factor for sleep disorders.

Background
: There are a few studies on the effects of job-strain on the prevalence of sleep problems in the foreign countries. In Korea, it has not been studied till now. In this article, the combined effects of job strain, shift work and some life-style on the prevalence of sleep proplems were studied among workers in middle-aged men.

Methods : 998 cases were chosen from 1109 men who visited health screening certer form October to November, 1999. Sleep problems were categorized to insomnia, sleep deprivation, daytime sleepiness and snoring on the base of result of factor analysis of 11 questions. Job strain was measured by 11 questions which developed by Karasek by and Theorell. All data set were analyzed using Chi-square test and multiple logistic regression analysis.

Results : The 4 sleep problems were analyzed by multiple logistic regression analysis in relation to job strain, shift work, occupation, obesity, sedentary life-style, smoking, drinking. Insomnia was increased significantly from highest job-strain group (Odds ratio (OR:2.02)) and non-exercise group(OR:2.05). In these groups, daytime sleepiness was increased significantly(OR=1.92 in the highest job-strain group, OR=1.72 in non-exercise group). Sleep deprivation was increased in the highest job-strain group(OR=2.18), managers & clerks(OR:1.67) and non-exercise group(OR:1.78). Snoring was increased from BMI(Body mass index) ≥25(OR=1.77), BMI ≥27(OR=2.80) and non-exercise group(OR:1.87).

Conclusion : In the highest job strain group, insomnia, sleep deprivation and daytime sleepiness was increased significantly. And sedentary life-style increased all sleep problems.