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This study investigated change trajectories of sleep timing and chronotype from late pregnancy to 2\u2009years postpartum and examined longitudinal associations of chronotype with symptoms of insomnia, daytime sleep\u2010related impairment, and mood. Data were from a two\u2010arm randomised controlled trial testing parent\u2010focused wellbeing interventions. Participants were a community sample of nullipara without severe sleep\/mental health conditions. Participants self\u2010reported bedtime, rise\u2010time, chronotype, insomnia symptoms, sleep\u2010related impairment, depression, and anxiety at seven time points: gestation Weeks 30 and 35, and postpartum Months 1.5, 3, 6, 12 and 24. Trajectories were estimated using mixed\u2010effects models with continuous time, quadratic splines, and a knot at childbirth, controlling for age and group allocation. A total of 163 participants (mean [SD] age 33.35\u2009[3.42]\u2009years) took part. Bedtime and rise\u2010times delayed during late pregnancy (~8 and ~20\u2009min, respectively) but became progressively earlier (~20 and ~60\u2009min, respectively) over the 2 postpartum years. Chronotype became more eveningness in late pregnancy, and more morningness after childbirth, however changes were small. Controlling for sleep duration and efficiency, greater morningness was associated with significantly less symptoms of insomnia and sleep\u2010related impairment over time (all <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001); longitudinal associations between chronotype and symptoms of depression and anxiety were non\u2010significant (all <jats:italic>p<\/jats:italic>\u2009&gt;\u20090.65). Sleep\u2013wake timing and chronotype became progressively earlier from pregnancy to 2\u2009years postpartum. Morningness chronotype may be sleep\u2010protective during the transition from pregnancy to parenthood. Mechanisms underlying these associations require further research.<\/jats:p>","DOI":"10.1111\/jsr.14021","type":"journal-article","created":{"date-parts":[[2023,8,23]],"date-time":"2023-08-23T04:58:50Z","timestamp":1692766730000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Sleep\u2013wake timing and chronotype in perinatal periods: longitudinal changes and associations with insomnia symptoms, sleep\u2010related impairment, and mood from pregnancy to 2\u2009years postpartum"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1021-2296","authenticated-orcid":false,"given":"Sumedha","family":"Verma","sequence":"first","affiliation":[{"name":"The Turner Institute for Brain and Mental Health, School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences Monash University  Clayton Victoria 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