{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T05:01:53Z","timestamp":1790053313037,"version":"4.0.1"},"reference-count":59,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T00:00:00Z","timestamp":1769904000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/100000027","name":"National Institute on Alcohol Abuse and Alcoholism","doi-asserted-by":"publisher","award":["R01AA025626"],"award-info":[{"award-number":["R01AA025626"]}],"id":[{"id":"10.13039\/100000027","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Biol Rhythms"],"published-print":{"date-parts":[[2026,6]]},"abstract":"<jats:p>\n                    In adult samples, tightly-controlled laboratory studies indicate the presence of circadian rhythms in positive (and negative) affect. Naturalistic studies also suggest the presence of diurnal positive affect rhythms in adults, the characteristics (acrophase, mesor, and amplitude) of which vary by self-report circadian preference\u2014greater evening preference is associated with later acrophase, lower mesor, and lower amplitude in positive affect. We examined the extent to which diurnal affect rhythms are associated with 4 different measures of circadian timing, including dim light melatonin onset, in a sample of high-school adolescents who reported at least one drink of alcohol in their lifetime (\n                    <jats:italic toggle=\"yes\">N<\/jats:italic>\n                    \u2009=\u2009126, 17.3 \u00b1 0.87\u2009years, 55.6% female). Cosinor models found support for robust diurnal rhythms in positive, but not negative, affect. The overall modeled positive affect rhythm had an acrophase at 3:39 PM, a mesor of 9.77, and an amplitude of 1.61. Later circadian timing was associated with later acrophase in positive affect rhythms across the following measures: circadian preference (3:00 PM vs 4:20 PM,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009&lt;\u2009.001), chronotype (3:20 PM vs 4:11 PM,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u2009.014), and actigraphy-based midsleep (3:08 PM vs 4:16 PM,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u2009.014). We did not find significant associations between circadian phase (dim light melatonin onset) and positive affect rhythms. We also explored weekday-weekend differences in positive affect rhythms, finding significantly higher mesor (9.71 vs 9.99,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u2009.004) and lower amplitude (1.69 vs 1.26,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u2009.008) on the weekends than weekdays. In sum, compared to their peers, adolescents with later sleep and circadian timing experience a delayed peak in positive affect during the day, which may have consequences for behavioral activation and depressed mood. These findings underscore the importance of considering the role of sleep and circadian factors in affective processes during adolescence.\n                  <\/jats:p>","DOI":"10.1177\/07487304251408573","type":"journal-article","created":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T16:40:01Z","timestamp":1769964001000},"page":"366-379","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Circadian Timing Moderates Diurnal Positive Affect Rhythms in Adolescents"],"prefix":"10.1177","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-2137-512X","authenticated-orcid":false,"given":"Riya","family":"Mirchandaney","sequence":"first","affiliation":[{"name":"Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Delainey L.","family":"Wescott","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret C.","family":"Kuzemchak","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allysa D.","family":"Quick","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathryn","family":"Guo","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Duncan B.","family":"Clark","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel J.","family":"Buysse","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Greg J.","family":"Siegle","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meredith L.","family":"Wallace","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brant P.","family":"Hasler","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,2,1]]},"reference":[{"key":"e_1_3_3_2_1","doi-asserted-by":"crossref","unstructured":"Asarnow LD Bei B Krystal A Buysse DJ Thase ME Edinger JD Manber R (2019) Circadian preference as a moderator of depression outcome following cognitive behavioral therapy for insomnia plus antidepressant medications: a report from the TRIAD study. 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