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KMID : 0389520090160020085
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Sleep Medicine.Psychophysiology
2009 Volume.16 No. 2 p.85 ~ p.90
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A Study on the Relationship between Sleep Duration and Suicidal Idea in an Urban Area of South Korea
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Lee Yu-Jin
Cho Seong-Jin
Kim Seog-Ju
Cho In-Hee
Koh Seung-Hee
Kim Jong-Hoon
Bae Seung-Min
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Abstract
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Introduction: There has been an increasing interest in the relationship between sleep and suicidality. In addition, suicidal patients habitually report their sleep problems. Although sleep-related complaints and electroencephalographic changes are generally encountered in psychiatric disorders, sleep complaints such as insomnia, hypersomnia and nightmares are more common in suicidal patients. In current study, we aimed at investigating the relationship between self-reported sleep duration and suicidality in general population.
Methods: One thousand general population (male : female=500 : 500, mean age=39.6+/-11.6 years, ranged age=20-77 years) completed Center for Epidemiologic Study-Depression (CES-D), Beck Suicide Intent scale (BSI), Spielberger State-Trait Anger Expression Inventory (STAXI), Barratt Impulsiveness Scale (BIS), Morningness-Eveningness Scale (MES) and brief questionnaire of sleep habits.
Results: After controlling for age and sex, score of BSI was correlated positively with the score of CES-D, STAXI and BIS on partial correlation analysis (r(p)=0.251 ; p<0.001, r(p)=0.352 ; p<0.001, and r(p)=0.175 ; p<0.001, respectively). In addition, score of BSI was inversely correlated with the score of MES (r(p)=-0.066; p=0.037). However, score of BSI showed no significant correlation with sleep duration. However, regression analysis revealed that short (<6 hrs) or long (>10 hrs) sleep duration, the family history of psychiatric illness, the score of CES-D, and the score of STAXI predicted higher score of BSI significantly in total subjects (F=17.837, adjusted R2 =0.166 ; p=0.003, p=0.003, p<0.001, and p=0.003, respectively). This model was explained better in depressed subjects with 16 or higher score of CES-D (F=9.920, adjusted R2=0.298).
Conclusion: Current result suggested that not only short sleep duration (<6 hrs) but also long sleep duration (>10 hrs) might be related to suicidality.
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KEYWORD
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Sleep duration, Suicidality, Depression
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