Shift workers sleeping for <6 or ≥10 hours a day are associated with a higher risk of .
Individuals working more than 52 hours a week may experience a higher risk of suicidal ideation compared to those working 40 hours or less.
The association between working hours and suicidal ideation appears to be stronger in men than in women.
Younger shift workers (aged <45 years) may be more vulnerable to suicidal ideation related to long working hours compared to older workers (aged ≥45 years).
Both insufficient and excessive sleep duration may be linked to an increased risk of suicidal thoughts among shift workers.
Simplified
OBJECTIVE: This study investigated whether sleep duration and working hours were associated with the risk of .
METHODS: Data from 13,628 shift workers (age ≥19) were obtained from the nationwide cross-sectional Korea National Health and Nutrition Examination Surveys conducted in 2007-2018. We included healthy shift workers without depressive disorders and chronic medical illnesses. Sleep duration, working hours, and suicidal ideation were assessed using a self-reported questionnaire. Logistic regressions were used to examine the association of sleep duration and working hours with the risk of suicidal ideation. We examined interactions between sleep duration and working hours in association with suicidal ideation. In addition, interactions of sex or age were also analyzed.
RESULTS: Shift workers sleeping for <6 and ≥10 hours/day were associated with suicidal ideation compared with those sleeping for 7 to <9 hours/day. Individuals working >52 hours/week had a higher risk of suicidal ideation compared with those working ≤40 hours/week. In terms of interaction by sex or age groups in the association between working hours and the risk of suicidal ideation, the relationship was stronger for men than for women and for those aged <45 years than for those aged ≥45 years.
CONCLUSION: Shorter or longer sleep durations, and long working hours were associated with a higher risk of suicidal ideation. Under long working hours, male shift workers or those aged <45 years were more vulnerable to suicidal ideation.
Key numbers
36%
Increased Risk of
Compared to those sleeping 7 to <9 hours/day.
30%
Increased Risk of
Compared to those working ≤40 hours/week.
1,443 of 13,628
Prevalence of
Among surveyed shift workers.
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