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Day workers suffering from a wider range of sleep problems are more likely to experience suicidality

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ABSTRACT

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.

Electronic supplementary material: The online version of this article (doi:10.1007/s41105-016-0067-5) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus

Displaying 3-dimensional sleep conditions of the eight sleep types and 3DSS scores (mean ± standard deviation)
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Fig1: Displaying 3-dimensional sleep conditions of the eight sleep types and 3DSS scores (mean ± standard deviation)

Mentions: We used the 3DSS as a sleep scale. It is designed for use with Japanese day workers and its reliability and validity have been established [7]. The 3DSS consists of three categories (phase, quality, and quantity). All questions ask about usual sleep habits in the past month. Each category consists of five questions, for a total of 15 questions. Respondents choose a response option that fits their sleep habits from among four choices (questions, responses, and scoring methods are presented in the Supplementary Material). The range of each category’s score is 0–15; the higher the score, the better the sleep status. The cut-off value for phase or quantity scores is 8/9, and that of quality scores is 10/11 [8]. Table 1 and Fig. 1 displays the eight sleep types based on cut-off points.Table 1


Day workers suffering from a wider range of sleep problems are more likely to experience suicidality
Displaying 3-dimensional sleep conditions of the eight sleep types and 3DSS scores (mean ± standard deviation)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037152&req=5

Fig1: Displaying 3-dimensional sleep conditions of the eight sleep types and 3DSS scores (mean ± standard deviation)
Mentions: We used the 3DSS as a sleep scale. It is designed for use with Japanese day workers and its reliability and validity have been established [7]. The 3DSS consists of three categories (phase, quality, and quantity). All questions ask about usual sleep habits in the past month. Each category consists of five questions, for a total of 15 questions. Respondents choose a response option that fits their sleep habits from among four choices (questions, responses, and scoring methods are presented in the Supplementary Material). The range of each category’s score is 0–15; the higher the score, the better the sleep status. The cut-off value for phase or quantity scores is 8/9, and that of quality scores is 10/11 [8]. Table 1 and Fig. 1 displays the eight sleep types based on cut-off points.Table 1

View Article: PubMed Central - PubMed

ABSTRACT

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.

Electronic supplementary material: The online version of this article (doi:10.1007/s41105-016-0067-5) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus