{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T18:07:24Z","timestamp":1788890844584,"version":"build-2803163510"},"reference-count":49,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2026,3,29]],"date-time":"2026-03-29T00:00:00Z","timestamp":1774742400000},"content-version":"vor","delay-in-days":87,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000874","name":"Brain & Behavior Research Foundation","doi-asserted-by":"publisher","award":["27013"],"award-info":[{"award-number":["27013"]}],"id":[{"id":"10.13039\/100000874","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>This study examined whether increasing sleep duration was associated with changes in daily affect, specifically, increases in positive affect (PA) and decreases in negative affect (NA), among short-sleeping adolescents.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Healthy, short-sleeping adolescents (reporting &amp;lt;8\u2009h sleep on school nights based on parent and adolescent screening questionnaires, n\u2009=\u200941, 14-17\u2009years) participated in 1\u2009week of baseline monitoring, then were randomized to either sleep extension (EXT; +90\u2009min in bed; n\u2009=\u200921) or habitual sleep (HAB; n\u2009=\u200920) for 2\u2009weeks. Both conditions established fixed bedtime and rise-time to reduce sleep variability. Sleep duration was assessed via wrist actigraphy. Participants completed the 22-item Profile of Mood States twice daily: soon after waking and at bedtime during the 3-week protocol.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>During the initial preintervention week, average nightly sleep duration was 6.42\u2009h (SD\u2009=\u20091.16). In the experimental weeks, HAB averaged 6.22\u2009h (SD\u2009=\u20090.95), while EXT increased to 7.00\u2009h (SD\u2009=\u20090.68; P\u00a0=\u2009.002). This between-group difference represented a large effect (Hedges\u2019 g\u2009\u2248\u20090.87), confirming that the manipulation increased sleep duration. Morning PA increased significantly in both conditions (P\u00a0&amp;lt;\u2009.001). There were no significant differences in morning or evening affect between the EXT and HAB conditions. Adolescents experienced lower morning NA after nights when they slept longer, based on a secondary analysis conducted in the full sample, regardless of the experimental condition (P\u2009=\u2009.005). Further, adolescents with higher average sleep duration had lower evening PA regardless of the experimental condition (P\u2009=\u2009.03). Morning PA increased from baseline to the experimental weeks in both conditions. Unexpectedly, higher between-person total sleep duration was associated with diminished evening PA, emphasizing the nuanced role of sleep patterns in shaping affective states.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Increasing nightly sleep is feasible for short-sleeping adolescents and resulted in longer sleep duration. Although affect did not differ between groups over the short intervention period, daily associations suggest that sleep may play a role in adolescents\u2019 emotional experiences. Longer or more intensive sleep interventions may be needed to detect group-level changes in affect.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/abm\/kaag008","type":"journal-article","created":{"date-parts":[[2026,3,29]],"date-time":"2026-03-29T13:55:58Z","timestamp":1774792558000},"source":"Crossref","is-referenced-by-count":0,"title":["Examining the impact of total sleep duration on daily affect among short-sleeping adolescents: an experimental study"],"prefix":"10.1093","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9471-0967","authenticated-orcid":false,"given":"Avah","family":"Mousavi-Raad","sequence":"first","affiliation":[{"name":"RAND Corporation, Division of Social and Economic Well-being , Santa Monica, CA 90401,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariel","family":"Neikrug","sequence":"additional","affiliation":[{"name":"Department of Psychiatry & Human Behavior, School of Medicine, University of California Irvine , Irvine, CA 92617,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5740-8769","authenticated-orcid":false,"given":"Dean","family":"Beebe","sequence":"additional","affiliation":[{"name":"Division of Behavioral Medicine and Clinical Psychology, Cincinnati Children\u2019s Hospital Medical Center , Cincinnati, OH 45229,","place":["United States"]},{"name":"Department of Pediatrics, University of Cincinnati College of Medicine , Cincinnati, OH 45229,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uma","family":"Rao","sequence":"additional","affiliation":[{"name":"Department of Psychiatry & Human Behavior, School of Medicine, University of California Irvine , Irvine, CA 92617,","place":["United States"]},{"name":"Department of Psychological Science, School of Social Ecology, University of California, Irvine , Irvine, CA 92617,","place":["United States"]},{"name":"Department of Psychiatry, Children\u2019s Hospital of Orange County (CHOC) , Orange, CA 92868,","place":["United States"]},{"name":"Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience & Human Behavior, University of California, Los Angeles , Los Angeles, CA\u00a090095,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica","family":"Borelli","sequence":"additional","affiliation":[{"name":"Department of Psychological Science, School of Social Ecology, University of California, Irvine , Irvine, CA 92617,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kate R","family":"Kuhlman","sequence":"additional","affiliation":[{"name":"Department of Psychological Science, School of Social Ecology, University of California, Irvine , Irvine, CA 92617,","place":["United States"]},{"name":"Department of Psychiatry, Children\u2019s Hospital of Orange County (CHOC) , Orange, CA 92868,","place":["United States"]},{"name":"Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience & Human Behavior, University of California, Los Angeles , Los Angeles, CA\u00a090095,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,3,29]]},"reference":[{"key":"2026090813161611900_kaag008-B1","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1080\/15374416.2017.1357126","article-title":"Individual differences in optimum sleep for daily mood during adolescence","volume":"48","author":"Fuligni","year":"2019","journal-title":"J Clin Child Adolesc Psychol"},{"key":"2026090813161611900_kaag008-B2","doi-asserted-by":"crossref","first-page":"318","DOI":"10.1111\/jsr.12373","article-title":"Sleep and academic performance in later adolescence: results from a large population-based study","volume":"25","author":"Hysing","year":"2016","journal-title":"J Sleep Res"},{"key":"2026090813161611900_kaag008-B3","doi-asserted-by":"crossref","first-page":"275","DOI":"10.1016\/j.neuroimage.2013.01.025","article-title":"The effects of poor quality sleep on brain function and risk taking in adolescence","volume":"71","author":"Telzer","year":"2013","journal-title":"Neuroimage"},{"key":"2026090813161611900_kaag008-B4","author":"CDC","year":"2024"},{"key":"2026090813161611900_kaag008-B5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1196\/annals.1308.001","article-title":"Adolescent brain development: a period of vulnerabilities and opportunities. 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