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Open AccessArticle

Association of Bedtime with both Suicidal Ideation and Suicide Planning among Korean Adolescents

1
Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea
2
Institute of Health Services Research, Yonsei University, Seoul 03722, Korea
3
Department of Preventive Medicine, Yonsei University College of Medicine, Seoul 03722, Korea
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(20), 3817; https://doi.org/10.3390/ijerph16203817
Received: 21 September 2019 / Revised: 5 October 2019 / Accepted: 6 October 2019 / Published: 10 October 2019
Study Objectives: In comparison to other countries, the South Korean population has a short average sleep duration, and studies have suggested that insufficient sleep is a risk factor for suicidal behavior. This study aimed to examine the association of bedtime with suicidal ideation and with suicide planning, respectively, among Korean adolescents. Methods: This study included 48,218 participants from the 2017 Korea Youth Risk Behavior Web-based Survey. Participants were divided into three categories: pre-23:00 bedtime, 23:00–01:30 bedtime, and post-01:30 bedtime. Suicidal ideation and suicide planning were the main dependent variables, and multiple logistic regression analysis was performed to examine the target association. Results: For both male and female respondents, compared to those who had a pre-23:00 bedtime, those whose bedtime was after 01:30 were more likely to have suicidal ideation (post-01:30 bedtime for men: OR = 1.29, 95% CI = 1.16–1.45; for women: OR = 1.32, 95% CI = 1.20–1.44). For suicide planning, the results were also significant for both genders (post-01:30 bedtime for men: OR = 1.41, 95% CI = 1.16–1.70; for women: OR = 1.21, 95% CI = 1.03–1.43). Odds of suicidal ideation were higher for those who had a post-01:30 bedtime on weekdays but not weekends. Conclusions: We found that, among adolescents, going to bed after 01:30 is significantly associated with suicidal ideation and suicide planning, after adjusting for demographic, socioeconomic, and health-related characteristics. Therefore, late bedtime should be the timepoint of a suicide intervention for adolescents, in order to prevent developing suicidal ideations and suicide planning. View Full-Text
Keywords: sleep; bedtime; suicidal ideation; suicide planning sleep; bedtime; suicidal ideation; suicide planning
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Jeong, W.; Kim, Y.K.; Lee, H.J.; Jang, J.; Kim, S.; Park, E.-C.; Jang, S.-I. Association of Bedtime with both Suicidal Ideation and Suicide Planning among Korean Adolescents. Int. J. Environ. Res. Public Health 2019, 16, 3817.

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