{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T07:01:58Z","timestamp":1771052518971,"version":"3.50.1"},"reference-count":13,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2025,6,15]],"date-time":"2025-06-15T00:00:00Z","timestamp":1749945600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2025,6,15]],"date-time":"2025-06-15T00:00:00Z","timestamp":1749945600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Sleep Research"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>This study investigated the relationship between insomnia frequency and objective short sleep, a phenotype of insomnia. The hypothesis is that individuals with objective short sleep simply have more nights of insomnia per week. Data from a randomised controlled trial of Cognitive Behavioural Therapy for Insomnia combined with zolpidem and\/or additional maintenance sessions were analysed. Insomnia frequency was derived from pre\u2010treatment sleep diaries, using two definitions: nights with self\u2010reported sleep latency (SL) or wake after sleep onset (WASO) &gt;\u200930\u2009min, and nights with self\u2010reported sleep duration &lt;\u20096\u2009h. Objective short sleep was assessed via PSG sleep study, using &lt;\u20096\u2009h as the threshold. Results showed that objective short sleep was associated with more frequent insomnia when defined as nights with sleep duration &lt;\u20096\u2009h (8.1\u2009\u00b1\u20094.2 vs. 5.9\u2009\u00b1\u20093.7 nights\/fortnight for short sleepers vs. normal sleepers, respectively), but not for nights with SL or WASO &gt;\u200930\u2009min. While insomnia frequency may partially explain objective short sleep, other factors likely influence this phenotype. Further studies are needed to explore the mechanisms underlying objective short sleep insomnia.<\/jats:p>","DOI":"10.1111\/jsr.70122","type":"journal-article","created":{"date-parts":[[2025,6,15]],"date-time":"2025-06-15T21:23:28Z","timestamp":1750022608000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Is Objective Short Sleep a Proxy for Frequent Insomnia?"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0707-8068","authenticated-orcid":false,"given":"Hannah","family":"Scott","sequence":"first","affiliation":[{"name":"Adelaide Institute for Sleep Health: A Flinders Centre of Research Excellence, College of Medicine and Public Health, Flinders University  Adelaide Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6341-5594","authenticated-orcid":false,"given":"Janet M. Y.","family":"Cheung","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health, School of Pharmacy The University of Sydney  Sydney Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4826-8498","authenticated-orcid":false,"given":"Alexandria","family":"Muench","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hans","family":"Ivers","sequence":"additional","affiliation":[{"name":"School of Psychology and BRAIN Research Center Universit\u00e9 Laval  Qu\u00e9bec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8649-8895","authenticated-orcid":false,"given":"Charles M.","family":"Morin","sequence":"additional","affiliation":[{"name":"School of Psychology and BRAIN Research Center Universit\u00e9 Laval  Qu\u00e9bec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael L.","family":"Perlis","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,6,15]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"International Classification of Sleep Disorders: Diagnostic and Coding Manual","author":"American Academy of Sleep Medicine","year":"2005"},{"issue":"1","key":"e_1_2_9_3_1","article-title":"Insomnia Patients With Objective Short Sleep Duration Have a Blunted Response to Cognitive Behavioral Therapy for Insomnia","volume":"40","author":"Bathgate C. 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