{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T07:27:01Z","timestamp":1792135621104,"version":"4.4.0"},"reference-count":46,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2013,11,20]],"date-time":"2013-11-20T00:00:00Z","timestamp":1384905600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Research Institute of Child Development and Education, Faculty of Social and Behavioural Sciences, University of Amsterdam"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Child Psychology Psychiatry"],"published-print":{"date-parts":[[2014,3]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>Sleep problems are common and persistent during adolescence and can have negative effects on adolescents' mood. To date, studies that investigate the effects of sleep extension on adolescents' sleep and depressive symptoms are still lacking. This study aims to investigate the effects of gradual sleep extension combined with sleep hygiene advice in adolescents with chronic sleep reduction on objectively measured sleep, self\u2010reported sleep problems and depressive symptoms.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Fifty\u2010five adolescents with chronic sleep reduction (mean age: 15.44\u00a0years; 85.5% females) were included in the study. Participants were randomly assigned to either a sleep extension group (gradual sleep extension by advancing bedtimes in the evening and receiving sleep hygiene advice) or to a control group (no instruction). Sleep was measured with actigraphy during three\u00a0weeks, the first week was the baseline week, and the last two\u00a0weeks were the experimental weeks during which sleep was extended. Other outcome variables were self\u2010reported sleep problems (daytime sleepiness, symptoms of insomnia and circadian rhythm sleep disorder) and depressive symptoms, which were assessed before and after the experimental manipulation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>During the third week of the experiment, adolescents in the sleep extension group had earlier bedtimes, earlier sleep onsets, spent more time in bed and slept longer than adolescents in the control group. Their chronic sleep reduction, insomnia symptoms and depressive symptoms diminished significantly. In addition, there was a trend of improved circadian rhythm sleep disorder symptoms and sleep quality.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Gradual sleep extension combined with sleep hygiene advice seems to have beneficial effects on sleep, self\u2010reported sleep problems and depressive symptoms of adolescents with chronic sleep reduction. Although we cannot distinguish between the effects of sleep extension and sleep hygiene advice, the results suggest that advancing bedtimes can extend sleep and improve depressive symptoms.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jcpp.12157","type":"journal-article","created":{"date-parts":[[2013,11,20]],"date-time":"2013-11-20T06:41:07Z","timestamp":1384929667000},"page":"273-283","source":"Crossref","is-referenced-by-count":114,"title":["The effects of sleep extension and sleep hygiene advice on sleep and depressive symptoms in adolescents: a randomized controlled trial"],"prefix":"10.1111","volume":"55","author":[{"given":"J.F.","family":"Dewald\u2010Kaufmann","sequence":"first","affiliation":[{"name":"Research Institute of Child Development and Education Faculty of Social and Behavioural Sciences University of Amsterdam Amsterdam The Netherlands"},{"name":"Department of Pediatric Endocrinology Dr. von Hauner Children's Hospital Ludwig\u2010Maximilians University Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.J.","family":"Oort","sequence":"additional","affiliation":[{"name":"Research Institute of Child Development and Education Faculty of Social and Behavioural Sciences University of Amsterdam Amsterdam The Netherlands"},{"name":"Department of Medical Psychology Academic Medical Centre University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.M.","family":"Meijer","sequence":"additional","affiliation":[{"name":"Research Institute of Child Development and Education Faculty of Social and Behavioural Sciences University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,11,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2008-1182"},{"key":"e_1_2_8_3_1","first-page":"348","article-title":"When worlds collide: Adolescent need for sleep versus societal demands","volume":"80","author":"Carskadon M.A.","year":"1999","journal-title":"Phi Delta Kappan"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chc.2012.01.006"},{"key":"e_1_2_8_5_1","volume-title":"Statistical power analysis for the behavioral sciences","author":"Cohen J.","year":"1988"},{"key":"e_1_2_8_6_1","first-page":"469","article-title":"Modifications to weekend recovery sleep delay circadian phase in older adolescents","volume":"27","author":"Crowly S.J.","year":"2010","journal-title":"Chronobiology International"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.smrv.2005.11.001"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7610.2011.02502.x"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1054-139X(02)00506-2"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1080\/15402002.2013.784703"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.smrv.2009.10.004"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2869.2012.00999.x"},{"key":"e_1_2_8_13_1","first-page":"267","article-title":"Cumulative sleepiness, mood disturbances and psychomotor vigilance performance decrements during a week of sleep restricted to 4\u20105\u00a0hours per night","volume":"20","author":"Dinges D.F.","year":"1997","journal-title":"Sleep"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.2466\/pms.2001.93.1.213"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1053\/smrv.2001.0192"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/33.1.97"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2458-6-116"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10802-005-1824-0"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/32.2.189"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.smrv.2011.03.007"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2012-0564"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/14.6.540"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2869.2000.00177.x"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/20.10.844"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2869.2012.01041.x"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.3102\/0013189X11402323"},{"key":"e_1_2_8_27_1","volume-title":"Childrens's Depression Inventory. 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