Environmental and
Occupational Health Practice
The Environmental and Occupational Health Practice(EOH-P)is published by the Japan Society for Occupational Health. EOH-P welcoms papers from across the occupational health and allied areas. EOH-P primarily seeks to publish reports on knowledge gained through practice, which has important empirical value for occupational health. It also seeks to publish papers on environment issues.

Reduced Working Hours Insufficient for Improving the Sleep Durations of Japanese Employees

Working long hours has been shown to negatively affect sleeping patterns and increase the likelihood of coronary heart disease and strokes. Japanese employees are known for working longer hours, which has led to “Karoshi”, or death from overwork, in several cases. The government has since mandated that companies curtail overtime hours and introduce measures to improve workers’ lifestyles. To investigate how workplace reforms have affected the health of employees, we examined the sleep duration in workers before and after the policy came into being.

We sent out a questionnaire survey to employees of an electrical firm before and after it instituted reforms to reduce working hours. Of the more than 3000 people who responded, we found that short sleep durations increased only slightly over three years. The reforms did not remarkably improve sleep habits, a finding that contradicts an earlier study which showed a positive link between long working hours and short sleeping hours. From our findings, it also appeared that the slight increase in sleeping time was unaffected by the new rules and may have had more to do with the aging process because the older we get, the more sleep we seem to require.

Our research suggests that a reduction in working hours may not by itself bring about lifestyle changes in Japanese employees. Employers may have to consider a host of other measures such as educating workers on the importance of sleep practices. Further studies with longer follow-up periods will also help in outlining methods to improve employee health and wellbeing.

Link to the original journal article:

Title of the paper

Impact of a reduction in overtime hours on sleep duration among Japanese employees


Teppei Imai, Keisuke Kuwahara, Isamu Kabe, Yohei Kawasaki, Tetsuya Mizoue, Seitaro Dohi



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Journal Info

Online ISSN : 2434-4931
Review process
Average 46.14 days from submission to first decision
Average 120.95 days from submission to acceptance
Impact Factor (2019) : 0000