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In the present secondary data analysis, a squared term confirmed the importance of both short and long total sleep time on suicidal behaviour. Total sleep time had a significant positive direct effect on suicidal behaviour (<jats:italic>b\u00a0<\/jats:italic>=\u00a00.20, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.08, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.05), significant negative direct effects on insomnia symptoms (<jats:italic>b\u00a0<\/jats:italic>=\u00a0\u22121.67, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.13, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001) and on depressive symptoms (<jats:italic>b\u00a0<\/jats:italic>=\u00a0\u22121.76, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.29, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001). Depression had a significant positive effect on suicidal behaviour (<jats:italic>b\u00a0<\/jats:italic>=\u00a00.17, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.01, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001), and significantly mediated the relationship between total sleep time and suicidal behaviour, but insomnia symptoms did not. Total sleep time squared had a significant positive relationship with suicidal behaviour (<jats:italic>b\u00a0<\/jats:italic>=\u00a00.02, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.01, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.05), significant negative direct effects on insomnia symptoms (<jats:italic>b\u00a0<\/jats:italic>=\u00a0\u22120.12, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.01, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001) and on depressive symptoms (<jats:italic>b\u00a0<\/jats:italic>=\u00a0\u22120.12, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.02, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001). Depression had a significant positive effect on suicidal behaviour (<jats:italic>b\u00a0<\/jats:italic>=\u00a00.17, <jats:styled-content style=\"fixed-case\">SE<\/jats:styled-content><jats:italic>\u00a0<\/jats:italic>=\u00a00.01, <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.0001), and significantly mediated the relationship between total sleep time and suicidal behaviour. These results suggest the importance of assessing for total sleep time in clinical settings with regard to suicide risk.<\/jats:p>","DOI":"10.1111\/jsr.12563","type":"journal-article","created":{"date-parts":[[2017,6,1]],"date-time":"2017-06-01T08:52:42Z","timestamp":1496307162000},"page":"732-738","source":"Crossref","is-referenced-by-count":22,"title":["Total sleep time as a predictor of suicidal behaviour"],"prefix":"10.1111","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4122-6546","authenticated-orcid":false,"given":"Matthew S.","family":"Michaels","sequence":"first","affiliation":[{"name":"Florida State University Tallahassee FL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tia","family":"Balthrop","sequence":"additional","affiliation":[{"name":"Florida State University Tallahassee FL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael R.","family":"Nadorff","sequence":"additional","affiliation":[{"name":"Mississippi State University Starkville MS USA"},{"name":"Department of Psychiatry and Behavioral Sciences Baylor College of Medicine Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas E.","family":"Joiner","sequence":"additional","affiliation":[{"name":"Florida State University Tallahassee FL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,6]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.4088\/JCP.v58n0602"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0889-7204.2004.02422.x"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1389-9457(00)00065-4"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/30.12.1739"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2014.1126"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0076646"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11136-009-9462-6"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/ijo.2011.110"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1037\/1053-0797.16.1.1"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/brb3.576"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.sleep.2008.04.005"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1176\/ajp.147.9.1189"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.5664\/jcsm.5270"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1037\/0022-006X.76.1.84"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/29.8.1009"},{"key":"e_1_2_8_17_1","volume-title":"Introduction to Mediation, Moderation, and Conditional Process Analysis: A Regression\u2010based Approach","author":"Hayes A. 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