{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,15]],"date-time":"2026-02-15T09:26:06Z","timestamp":1771147566536,"version":"3.50.1"},"reference-count":55,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2023,5,6]],"date-time":"2023-05-06T00:00:00Z","timestamp":1683331200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000265","name":"Medical Research Council","doi-asserted-by":"publisher","award":["G1100559"],"award-info":[{"award-number":["G1100559"]}],"id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000265","name":"Medical Research Council","doi-asserted-by":"publisher","award":["MR\/V012878\/1"],"award-info":[{"award-number":["MR\/V012878\/1"]}],"id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000265","name":"Medical Research Council","doi-asserted-by":"publisher","award":["MR\/M021475\/1"],"award-info":[{"award-number":["MR\/M021475\/1"]}],"id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCPP Advances"],"published-print":{"date-parts":[[2023,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Insomnia with short sleep duration has been postulated as more severe than that accompanied by normal\/long sleep length. While the short duration subtype is considered to have greater genetic influence than the other subtype, no studies have addressed this question. This study aimed to compare these subtypes in terms of: (1) the heritability of insomnia symptoms; (2) polygenic scores (PGS) for insomnia symptoms and sleep duration; (3) the associations between insomnia symptoms and a wide variety of traits\/disorders.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The sample comprised 4000 pairs of twins aged 16 from the Twins Early Development Study. Twin models were fitted to estimate the heritability of insomnia in both groups. PGS were calculated for self\u2010reported insomnia and sleep duration and compared among participants with short and normal\/long sleep duration.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Heritability was not significantly different in the short sleep duration group (<jats:italic>A<\/jats:italic>\u00a0=\u00a00.13 [95%CI\u00a0=\u00a00.01, 0.32]) and the normal\/long sleep duration group (<jats:italic>A<\/jats:italic>\u00a0=\u00a00.35 [95%CI\u00a0=\u00a00.29, 0.40]). Shared environmental factors accounted for a substantial proportion of the variance in the short sleep duration group (<jats:italic>C<\/jats:italic>\u00a0=\u00a00.19 [95%CI\u00a0=\u00a00.05, 0.32]) but not in the normal\/long sleep duration group (<jats:italic>C<\/jats:italic>\u00a0=\u00a00.00 [95%CI\u00a0=\u00a00.00, 0.04]). PGS did not differ significantly between groups although results were in the direction expected by the theory. Our results also showed that insomnia with short (as compared to normal\/long) sleep duration had a stronger association with anxiety and depression (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.05)\u2014although not once adjusting for multiple testing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We found mixed results in relation to the expected differences between the insomnia subtypes in adolescents. Future research needs to further establish cut\u2010offs for \u2018short\u2019 sleep at different developmental stages and employ objective measures of sleep.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcv2.12167","type":"journal-article","created":{"date-parts":[[2023,5,6]],"date-time":"2023-05-06T10:53:22Z","timestamp":1683370402000},"source":"Crossref","is-referenced-by-count":3,"title":["Sub\u2010types of insomnia in adolescents: Insights from a quantitative\/molecular twin study"],"prefix":"10.1002","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3450-1159","authenticated-orcid":false,"given":"Juan J.","family":"Madrid\u2010Valero","sequence":"first","affiliation":[{"name":"Department of Health Psychology Faculty of Health Sciences University of Alicante  Alicante Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fr\u00fchling","family":"Rijsdijk","sequence":"additional","affiliation":[{"name":"Social, Genetic and Developmental Psychiatry Centre Institute of Psychiatry, Psychology &amp; Neuroscience King's College London  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saskia","family":"Selzam","sequence":"additional","affiliation":[{"name":"Social, Genetic and Developmental Psychiatry Centre Institute of Psychiatry, Psychology &amp; Neuroscience King's College London  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helena M. 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