E Juulia Paavonen1, Outi Saarenpää-Heikkilä2, Isabel Morales-Munoz3, Minna Virta4, Niina Häkälä5, Pirjo Pölkki6, Anneli Kylliäinen7, Hasse Karlsson8, Tiina Paunio9, Linnea Karlsson10. 1. Paediatric Research Center, Child Psychiatry, the University of Helsinki and Helsinki University Hospital, Helsinki, Finland; Finnish Institute for Health and Welfare, Helsinki, Finland. Electronic address: juulia.paavonen@helsinki.fi. 2. Center for Child Health Research, Tampere University, Faculty of Medicine and Health Technology, Tampere University Hospital, Tampere, Finland. 3. Finnish Institute for Health and Welfare, Helsinki, Finland; Institute for Mental Health, School of Psychology, University of Birmingham, Birmingham, United Kingdom. 4. The FinnBrain Birth Cohort Study, Turku Brain and Mind Center, Institute of Clinical Medicine, University of Turku, Turku, Finland. 5. Finnish Institute for Health and Welfare, Helsinki, Finland. 6. Department of Social Sciences, University of Eastern Finland, Kuopio, Finland. 7. Psychology, Faculty of Social Sciences, Tampere University, Tampere, Finland. 8. The FinnBrain Birth Cohort Study, Turku Brain and Mind Center, Institute of Clinical Medicine, University of Turku, Turku, Finland; Department of Psychiatry, Turku University Hospital, University of Turku, Turku, Finland; Centre for Population Health Research, University of Turku, Turku University Hospital, Turku, Finland. 9. Finnish Institute for Health and Welfare, Helsinki, Finland; Department of Psychiatry and SleepWell Research Program, Faculty of Medicine, the University of Helsinki and Helsinki University Hospital, Helsinki, Finland. 10. The FinnBrain Birth Cohort Study, Turku Brain and Mind Center, Institute of Clinical Medicine, University of Turku, Turku, Finland; Department of Child Psychiatry, Turku University Hospital, University of Turku, Turku, Finland; Centre for Population Health Research, University of Turku, Turku University Hospital, Turku, Finland.
Abstract
OBJECTIVE: Sleep difficulties are highly prevalent and often persistent in young children, but sometimes parents are worried about sleep symptoms that belong to the normative range rather than to actual disturbances. Therefore, the aim of this study was to describe the normative development of sleep at the ages of 3, 6, 8, 12, 18 and 24 months in healthy children. METHODS: The present study is based on two birth cohorts that comprise representative samples of families recruited systematically during pregnancy. In the CHILD-SLEEP cohort, the sample sizes were 1427 at three, 1301 at eight, 1163 at 18, and 950 at 24 months. In the Finnbrain cohort, the sample sizes were 2002 at six months and 1693 at 12 months. Healthy term-born children were eligible for this study. To assess the infants' sleep duration and sleep quality, the Brief Infant Sleep Questionnaire was used in both cohorts and additionally the Infant Sleep Questionnaire in the CHILD-SLEEP cohort. The distributions of the study variables were reported using standard parameters. RESULTS: We found that sleep quality is highly variable particularly during the first two years of life, but this variability decreased markedly towards the second year. First, sleep latency decreased by the age of six months, while night-time sleep began to consolidate during the second year. However, parent-reported sleeping problems were common during the entire study period. CONCLUSION: As many families struggle with infants' sleeping problems, the reference values reported in this article can be valuable tools in various clinical settings to define clinically significant deviances in the sleep development and to identify individuals benefitting from counselling and clinical interventions.
OBJECTIVE: Sleep difficulties are highly prevalent and often persistent in young children, but sometimes parents are worried about sleep symptoms that belong to the normative range rather than to actual disturbances. Therefore, the aim of this study was to describe the normative development of sleep at the ages of 3, 6, 8, 12, 18 and 24 months in healthy children. METHODS: The present study is based on two birth cohorts that comprise representative samples of families recruited systematically during pregnancy. In the CHILD-SLEEP cohort, the sample sizes were 1427 at three, 1301 at eight, 1163 at 18, and 950 at 24 months. In the Finnbrain cohort, the sample sizes were 2002 at six months and 1693 at 12 months. Healthy term-born children were eligible for this study. To assess the infants' sleep duration and sleep quality, the Brief Infant Sleep Questionnaire was used in both cohorts and additionally the Infant Sleep Questionnaire in the CHILD-SLEEP cohort. The distributions of the study variables were reported using standard parameters. RESULTS: We found that sleep quality is highly variable particularly during the first two years of life, but this variability decreased markedly towards the second year. First, sleep latency decreased by the age of six months, while night-time sleep began to consolidate during the second year. However, parent-reported sleeping problems were common during the entire study period. CONCLUSION: As many families struggle with infants' sleeping problems, the reference values reported in this article can be valuable tools in various clinical settings to define clinically significant deviances in the sleep development and to identify individuals benefitting from counselling and clinical interventions.
Authors: Soraia Ventura; Sean R Mathieson; John M O'Toole; Vicki Livingstone; Mary-Anne Ryan; Geraldine B Boylan Journal: Sleep Date: 2022-01-11 Impact factor: 5.849
Authors: Isabel Morales-Muñoz; Sakari Lemola; Outi Saarenpää-Heikkilä; Anneli Kylliäinen; Pirjo Pölkki; Tiina Paunio; Matthew R Broome; E Juulia Paavonen Journal: BMJ Paediatr Open Date: 2020-03-10
Authors: Tiina E Mäkelä; Anneli Kylliäinen; Outi Saarenpää-Heikkilä; E Juulia Paavonen; Tiina Paunio; Jukka M Leppänen; Mikko J Peltola Journal: Sleep Date: 2021-12-10 Impact factor: 5.849