{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T09:17:10Z","timestamp":1788340630697,"version":"build-2803163510"},"reference-count":63,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T00:00:00Z","timestamp":1788307200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T00:00:00Z","timestamp":1788307200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100031319","name":"CogSleep Centre of Research Excellence","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100031319","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Sleep Research"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Light interventions have been investigated for treating sleep disturbances in older adults; however, findings are mixed. This proof\u2010of\u2010concept trial investigated the effect of blue\u2010enriched ambient light on electroencephalographic (EEG) sleep in older adults with self\u2010reported poor sleep. Twelve participants (65.6\u2009\u00b1\u20098.7\u2009years) were randomly exposed to two 72\u2010h in\u2010laboratory light conditions separated by 2\u2009weeks. During the day, participants were exposed to either blue\u2010enriched light (intervention: melanopic equivalent daylight illuminance (EDI)\u2009=\u2009843.6\u2009lx) or standard light (control: melanopic EDI\u2009=\u2009215.8\u2009lx). Three hours before habitual bedtime, illuminance was reduced, with greater blue light attenuation in the intervention (melanopic EDI\u2009=\u200949.5\u2009lx) than control (melanopic EDI\u2009=\u200960.8\u2009lx). On the third night, high\u2010density EEG sleep, cognitive performance and body temperature were assessed. The primary outcome was wake\u2010after\u2010sleep\u2010onset (WASO). Secondary outcomes included polysomnography\u2010derived sleep parameters, sleep spindles, cognitive performance and body temperature. High\u2010density EEG spectral power analyses were exploratory. There was no significant difference in WASO (136.1\u2009\u00b1\u200952.6\u2009min vs. 117.2\u2009\u00b1\u200943.9\u2009min;\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.338) between intervention and control. Intervention light significantly increased sigma activity (12\u201316\u2009Hz) during N1 (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.010) and N2 (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.017) sleep. The distal\u2010proximal skin temperature gradient (surrogate of peripheral heat dissipation) before and after lights out increased under intervention compared to control (\u22121.21\u00b0C\u2009\u00b1\u20091.44\u00b0C vs. \u22121.85\u00b0C\u2009\u00b1\u20091.39\u00b0C,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001). Daytime enrichment and evening depletion of blue light did not improve objective sleep outcomes in older people with sleep disturbance, but exploratory analyses showed increased sigma activity during sleep. Lighting interventions to improve sleep in older populations require further investigation.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial Registration:<\/jats:bold>\n                    ACTRN12619000138189\n                  <\/jats:p>","DOI":"10.1111\/jsr.70447","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T08:37:20Z","timestamp":1788338240000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Double\u2010Blind Randomised Controlled Crossover Trial of the Effect of Blue\u2010Enriched Ambient Light on Sleep in Older Adults With Sleep Disturbance: The\n                    <scp>CleverLights<\/scp>\n                    Study"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-8859-2461","authenticated-orcid":false,"given":"Teha B.","family":"Pun","sequence":"first","affiliation":[{"name":"School of Health 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Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Macquarie University  Sydney New South Wales Australia"},{"name":"School of Psychological Sciences, Faculty of Medicine, Health and Human Sciences Macquarie University  Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1368-0274","authenticated-orcid":false,"given":"Maria","family":"Comas","sequence":"additional","affiliation":[{"name":"CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Macquarie University  Sydney New South Wales Australia"},{"name":"Bioaraba Health Research Institute, Neuroscience, Sleep Disorders  Vitoria\u2010Gasteiz Spain"},{"name":"IKERBASQUE, Basque Foundation for Science  Bilbao Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8564-796X","authenticated-orcid":false,"given":"Angela 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