{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T19:01:54Z","timestamp":1790622114753,"version":"4.1.0"},"reference-count":41,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T00:00:00Z","timestamp":1780531200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T00:00:00Z","timestamp":1780531200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100021100","name":"Europ\u00e4ische Konf\u00f6deration der Oberrheinischen Universit\u00e4ten","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100021100","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Sleep Research"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:label\/>\n                    <jats:p>\n                      Cognitive behavioural therapy for insomnia (CBT\u2010I) is recommended as first\u2010line treatment for insomnia disorder. However, around 25% of the patients do not respond to the treatment, and only 40% achieve full remission. The current study investigates the therapeutic potential of light therapy as an add\u2010on to CBT\u2010I. Insomnia severity and questionnaire\u2010related secondary outcomes were assessed at baseline, post\u2010treatment and follow\u2010up. Sleep diary\u2010related variables and the cortisol awakening response were assessed at pre\u2010 and post\u2010treatment. Linear mixed models were calculated for each outcome variable. The study included 42 patients with insomnia disorder. Reduction in insomnia severity did not significantly differ between groups from baseline to post\u2010treatment (\n                      <jats:italic>\u03b2<\/jats:italic>\n                      \u2009=\u20090.35, SE\u2009=\u20091.31,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.792). Regarding exploratory secondary outcomes, daytime sleepiness was significantly more reduced from baseline to follow\u2010up in the CBT\u2010I\u2009+\u2009light therapy group than in the CBT\u2010I\u2009+\u2009placebo light group (\n                      <jats:italic>\u03b2<\/jats:italic>\n                      \u2009=\u2009\u22121.05, SE\u2009=\u20090.43,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.020). There was no significant condition\u2009\u00d7\u2009time point interaction effect for any of the other secondary outcomes. The findings show no significant add\u2010on effect of light therapy on insomnia severity. However, light therapy had a significant effect on daytime sleepiness that became evident only at the follow\u2010up. Given that daytime functioning is of high clinical relevance for patients with insomnia disorder, daytime sleepiness should be further evaluated as treatment target and may be addressed with light therapy.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial Registration<\/jats:title>\n                    <jats:p>ClinicalTrials.gov identifier: DRKS00029640<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jsr.70357","type":"journal-article","created":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T13:26:22Z","timestamp":1780579582000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Lights On or Off? The Efficacy of Light Therapy as Add\u2010On to Cognitive Behavioural Therapy for Insomnia\u2014A Pilot Study"],"prefix":"10.1111","volume":"35","author":[{"given":"Sarah R.","family":"Schmid","sequence":"first","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine","family":"Blume","sequence":"additional","affiliation":[{"name":"Centre for Chronobiology Psychiatric Hospital of the University of Basel  Basel Switzerland"},{"name":"Research Cluster Molecular and Cognitive Neurosciences University of Basel  Basel Switzerland"},{"name":"Department of Biomedicine University of Basel  Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4035-3308","authenticated-orcid":false,"given":"Johanna","family":"Ell","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikolas","family":"Konzen","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-1766-3322","authenticated-orcid":false,"given":"Matthias","family":"Apweiler","sequence":"additional","affiliation":[{"name":"Centre for Chronobiology Psychiatric Hospital of the University of Basel  Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9436-1258","authenticated-orcid":false,"given":"Bernd","family":"Feige","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernd L.","family":"Fiebich","sequence":"additional","affiliation":[{"name":"Neuroimmunology and Neurochemistry Research Group, Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julian E.","family":"Schiel","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katharina","family":"Domschke","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"},{"name":"German Center for Mental Health (DZPG) Partner Site Berlin\/Potsdam  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4133-3464","authenticated-orcid":false,"given":"Kai","family":"Spiegelhalder","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Psychotherapy, Medical Center\u2014University of Freiburg, Faculty of Medicine University of Freiburg  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,4]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.5935\/1984\u20100063.20190137"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00586611"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1389\u20109457(00)00065\u20104"},{"key":"e_1_2_12_5_1","volume-title":"Beck Depression Inventory\u2013II (BDI\u2010II)","author":"Beck A.","year":"1996"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpr.2020.101873"},{"key":"e_1_2_12_7_1","first-page":"3","volume-title":"Handbook of Clinical Neurology","author":"Blume C.","year":"2025"},{"key":"e_1_2_12_8_1","first-page":"395","volume-title":"Proceedings of the 80th Annual Convention of the American Psychological Association","author":"Bootzin R. 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