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The present study aims to contribute to the literature by developing, implementing, and evaluating a new internet\u2010based self\u2010help CBT\u2010I among community adults with mild\u2010to\u2010moderate insomnia in Hong Kong. Participants were randomly assigned to either a CBT\u2010I intervention group (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009179) or a waitlist control group (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009179). Both groups completed questionnaire measures at baseline (T1), immediately after the intervention (T2), and 4\u00a0weeks post\u2010intervention (T3). Compared to the control group, the intervention group demonstrated greater reductions in insomnia symptoms, sleep disturbance, pre\u2010sleep arousal, maladaptive sleep hygiene practices, dysfunctional beliefs and attitudes about sleep, depressive and anxiety symptoms, cognitive impairments, and work and social difficulties, as well as greater improvements in well\u2010being and health\u2010related quality of life at both T2 and T3. The effect sizes of these changes ranged from small to medium. Mediation analyses further revealed that pre\u2010sleep arousal significantly mediated the effects of the intervention on insomnia symptoms. Importantly, our findings demonstrate that internet\u2010based self\u2010help CBT\u2010I effectively reduces insomnia severity, with pre\u2010sleep arousal as a key mechanism, and yields broader benefits, such as alleviating affective symptoms and functional impairments and promoting health and wellness. Given its efficacy, accessibility, scalability, and cost\u2010effectiveness, this intervention represents a promising first\u2010line approach for managing insomnia in the community.\n                  <\/jats:p>","DOI":"10.1111\/aphw.70047","type":"journal-article","created":{"date-parts":[[2025,6,17]],"date-time":"2025-06-17T23:34:56Z","timestamp":1750203296000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effectiveness of internet\u2010based self\u2010help cognitive behavioral therapy for insomnia (CBT\u2010I) among community adults: A randomized controlled trial"],"prefix":"10.1111","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5199-2212","authenticated-orcid":false,"given":"Ka Long","family":"Chan","sequence":"first","affiliation":[{"name":"Integrated Mental Health Services Baptist Oi Kwan Social Service  Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nerissa 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