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This secondary data analysis explores how physical activity frequency and intensity are associated with sleep architecture. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Sixty-nine adults (mean age\u2009=\u200921.5\u00a0y, 63% female) wore a wrist-mounted fitness monitor to measure physical activity and sleep for 2 data collection intervals spanning a total of 8\u00a0months. Participants received triweekly electronic surveys asking to rank their levels of energy, stress, contentment, and sleep quality in the morning. Mixed effects linear models were used to determine the effects of physical activity frequency and intensity (light or moderate to vigorous) on sleep architecture, sleep quality, and mood. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Having more days with at least 10\u00a0minutes of moderate- to vigorous-intensity physical activity within a 5-day period was associated with a lower rapid eye movement\/nonrapid eye movement ratio in the first 180\u00a0minutes of sleep (<jats:italic>\u03b2<\/jats:italic>\u2009=\u2009\u22120.18, <jats:italic>P<\/jats:italic>\u2009=\u2009.018). Total light-intensity physical activity was associated with the same effect (<jats:italic>\u03b2<\/jats:italic>\u2009=\u2009\u22120.16, <jats:italic>P<\/jats:italic>\u2009=\u2009.048), as well as higher morning energy levels (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.16, <jats:italic>P<\/jats:italic>\u2009=\u2009.047). Within a day, the proportion of hours with at least 3\u00a0minutes of light-intensity physical activity was associated with greater sleep time and a lower rapid eye movement\/nonrapid eye movement ratio in the first 360\u00a0minutes of sleep (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.10, <jats:italic>P<\/jats:italic>\u2009=\u2009.049; <jats:italic>\u03b2<\/jats:italic>\u2009=\u2009\u22120.15, <jats:italic>P<\/jats:italic>\u2009=\u2009.022). The proportion of hours with at least 3\u00a0minutes of moderate- to vigorous-intensity physical activity was associated with morning contentment (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.13, <jats:italic>P<\/jats:italic>\u2009=\u2009.049). <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> This study suggests that the effects of physical activity on sleep are carried over across the week and identifies intraday and interday frequency to be important factors for consideration in physical activity interventions for improving sleep.<\/jats:p>","DOI":"10.1123\/jpah.2024-0844","type":"journal-article","created":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T13:32:24Z","timestamp":1751635944000},"page":"1042-1050","source":"Crossref","is-referenced-by-count":1,"title":["Physical Activity Frequency Patterns Influence Sleep Architecture in Young Adults"],"prefix":"10.1123","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-5799-6417","authenticated-orcid":true,"given":"Christian J.","family":"Corral","sequence":"first","affiliation":[{"name":"Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9727-6963","authenticated-orcid":true,"given":"Melissa","family":"Miller","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Texas at Austin, Austin, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3922-084X","authenticated-orcid":true,"given":"Frances A.","family":"Champagne","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Texas at Austin, Austin, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7472-2853","authenticated-orcid":true,"given":"David M.","family":"Schnyer","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Texas at Austin, Austin, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8541-0508","authenticated-orcid":true,"given":"Benjamin","family":"Baird","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Texas at Austin, Austin, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"12","key":"r1","series-title":"Mol Neurobiol","doi-asserted-by":"publisher","first-page":"6950","DOI":"10.1007\/s12035-023-03492-8","article-title":"Exercise reshapes the brain: molecular, cellular, and structural changes associated with cognitive improvements","volume":"60","author":"Augusto-Oliveira M","year":"2023","unstructured":"Augusto-Oliveira M, Arrifano GP, Leal-Nazar\u00e9 CG, et\u00a0al. 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