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Sleep and Biological Rhythms

, Volume 14, Issue 4, pp 369–376

First Online: 23 June 2016Received: 30 March 2016Accepted: 06 June 2016


Both a higher suicide rate and widespread sleep problems are serious health concerns in Japan when compared with those of other countries. We investigated the relationship between suicidal ideation and sleep problems in Japanese day workers using the 3-dimensional sleep scale 3DSS, which measures three sleep elements phase, quality, and quantity. Data from 635 Japanese day workers 461 mens and 174 womens were included. The 3DSS was used to assess participants’ sleep condition. Participants were classified into eight sleep types based on scores of phase, quality, and quantity: All Good Sleep, Owl poor phase, Inefficient poor quality, Short poor quantity, Owl + Inefficient poor phase and quality, Owl + Short poor phase and quantity, Inefficient + Short poor quality and quantity, and All Poor Sleep. We assessed participants’ suicidal ideation using question 19 of the self-rating depression scale SDS; 119 cases 18.7 % had ratings of 2–4 for this question and were considered to have suicidal ideation. The higher the number of sleep problems, the higher the risk of suicidal ideation compared to sleep types not indicative of problems. All Poor Sleep had the highest risk of the eight sleep types. Individuals with Owl + Short, Inefficient + Short, or All Poor Sleep had a significant risk of suicidal ideation even after adjusting for hopelessness and nightmares. Our findings suggested that sleep problems assessed by the 3DSS were related to suicidal ideation. Analysis of various aspects of sleep could be helpful for suicide prevention.

KeywordsDepression Sleep Sleep deprivation Suicidal ideation Suicide Electronic supplementary materialThe online version of this article doi:10.1007-s41105-016-0067-5 contains supplementary material, which is available to authorized users.

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Autor: Yuuki Matsumoto - Naohisa Uchimura - Tetsuya Ishida - Kouji Toyomasu - Yoshitaka Morimatsu - Mihoko Mori - Nanae Kushino -


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