{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T20:14:13Z","timestamp":1791317653549,"version":"4.3.1"},"reference-count":37,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T00:00:00Z","timestamp":1759276800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T00:00:00Z","timestamp":1759276800000},"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":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Problems with initiating and maintaining sleep are among the most common health complaints, with prevalence rates exceeding 50% depending on the survey. Preventing the progression to chronic insomnia may reduce public healthcare costs and prevent secondary illnesses. This study examined the effectiveness of a novel app\u2010based digital course using cognitive behavioural therapy for insomnia (CBT\u2010I) in preventing the manifestation of insomnia among individuals with sub\u2010threshold to moderate symptoms. Participants were assigned to an intervention group (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u2009191, ages 20\u201375) or a waitlist control group (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200972, ages 22\u201377) and assessed at three time points: Pre\u2010intervention (T0), Post\u2010intervention (T1, after 7\u2010week course) and Follow\u2010up (T2, 3\u2009months after course initiation) using the Insomnia Severity Index (ISI), Sleep Hygiene Index (SHI) and sleep diary entries. Results showed a significant reduction in insomnia severity (\u22124.8\u2009\u00b1\u20093.7\n                    <jats:styled-content style=\"fixed-case\">ISI<\/jats:styled-content>\n                    points) and improved sleep hygiene (\u22123.5\u2009\u00b1\u20094.5\n                    <jats:styled-content style=\"fixed-case\">SHI<\/jats:styled-content>\n                    points) from\n                    <jats:styled-content style=\"fixed-case\">T0<\/jats:styled-content>\n                    to\n                    <jats:styled-content style=\"fixed-case\">T1<\/jats:styled-content>\n                    (\n                    <jats:italic>d<\/jats:italic>\n                    \u2009=\u20091.35, and\n                    <jats:italic>d<\/jats:italic>\n                    \u2009=\u20090.69, respectively), with stable effects maintained at the 3\u2010month follow\u2010up. Remission was achieved by 48% of the intervention group compared to 18% of the control group. Improvements were also observed in sleep latency, sleep efficiency and reductions in nocturnal awakenings and wake time after sleep onset (\n                    <jats:italic>d<\/jats:italic>\n                    \u2009=\u20090.25\u20130.71). Activating evening activates, napping, irregular bedtimes, uncomfortable sleep environment, perceived stress and rumination significantly reduced (\n                    <jats:italic>d<\/jats:italic>\n                    \u2009=\u20090.16\u20130.59). Notably, 68% of users reported sustained improvements in their sleep. The findings indicate that various sleep hygiene behaviours can be effectively modified through an app\u2010based\n                    <jats:styled-content style=\"fixed-case\">CBT<\/jats:styled-content>\n                    \u2010I intervention.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial Registration:<\/jats:bold>\n                    This study was pre\u2010registered at Open Science Framework\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/osf.io\/yj2va\">https:\/\/osf.io\/yj2va<\/jats:ext-link>\n                  <\/jats:p>","DOI":"10.1111\/jsr.70195","type":"journal-article","created":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T09:43:11Z","timestamp":1759311791000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Digital App Based Cognitive Behaviour Therapy\n                    <scp>CBT<\/scp>\n                    \u2010I Course Improving Insomnia and Sleep Hygiene: A Randomised Controlled Trial"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7951-4642","authenticated-orcid":false,"given":"Maren\u2010Jo","family":"Kater","sequence":"first","affiliation":[{"name":"Developmental Psychology and Developmental Psychopathology, Faculty of Psychology and Sports Science Bielefeld University  Bielefeld Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nina","family":"Wegener","sequence":"additional","affiliation":[{"name":"Independent Psychologist  Gl\u00fccksburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-8119-4479","authenticated-orcid":false,"given":"Nicolas","family":"Morath","sequence":"additional","affiliation":[{"name":"Institute of Sport Science University of Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0452-4325","authenticated-orcid":false,"given":"Albrecht","family":"Vorster","sequence":"additional","affiliation":[{"name":"Swiss Sleep House Bern, Department of Neurology University Hospital Inselspital Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,1]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.smrv.2022.101646"},{"key":"e_1_2_12_3_1","volume-title":"Schlafst\u00f6rungen (2., \u00fcberarb. 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