An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate

Detalhes bibliográficos
Autor(a) principal: Clara, Maria Inês
Data de Publicação: 2020
Outros Autores: Allen Gomes, Ana
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/100926
https://doi.org/10.1016/j.sleep.2019.06.024
Resumo: Objective. It has been assumed that during adolescence there is a strong shift toward eveningness chronotype, whereas children's sleep is relatively stable. Several studies have focused on the conflict between school start times and adolescents' circadian rhythms; however, fewer studies have been conducted in younger children. The aim of this study was to examine sleep durations, schedules, and sleep phase shift in preschool- and school-aged children. Methods. Data for sleep patterns on school days and free days (ie, days when children's sleep−wake patterns were free from any influence of individual or family activities) was obtained by means of questionnaires (Children ChronoType Questionnaire) for 3155 Portuguese children 4–11 years of age. Results. As children grew older and school grade level increases, we found later bedtimes and sleep onsets on both school days and free days; and later wake times only on free days. By contrast, wake times were progressively earlier, imposed by school start times. There was a progressive reduction in the amount of sleep on school nights as grade level increased. Greater social jetlag, later midpoint of sleep, and higher restriction−extension patterns were found across age groups. Conclusion. The displacement of bed and wake times for later hours on free days starts at an early age. Changing early school start times could adjust social demands to the biological rhythm of children.
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spelling An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debatePre and primary school children; Pubertal transition; School start times; Sleep phase delay; Sleep schedules and durationsChildChild, PreschoolCircadian RhythmCross-Sectional StudiesFemaleHumansMalePortugalSleepSleep StagesSurveys and QuestionnairesTime FactorsEpidemiologic StudiesSchoolsStudentsObjective. It has been assumed that during adolescence there is a strong shift toward eveningness chronotype, whereas children's sleep is relatively stable. Several studies have focused on the conflict between school start times and adolescents' circadian rhythms; however, fewer studies have been conducted in younger children. The aim of this study was to examine sleep durations, schedules, and sleep phase shift in preschool- and school-aged children. Methods. Data for sleep patterns on school days and free days (ie, days when children's sleep−wake patterns were free from any influence of individual or family activities) was obtained by means of questionnaires (Children ChronoType Questionnaire) for 3155 Portuguese children 4–11 years of age. Results. As children grew older and school grade level increases, we found later bedtimes and sleep onsets on both school days and free days; and later wake times only on free days. By contrast, wake times were progressively earlier, imposed by school start times. There was a progressive reduction in the amount of sleep on school nights as grade level increased. Greater social jetlag, later midpoint of sleep, and higher restriction−extension patterns were found across age groups. Conclusion. The displacement of bed and wake times for later hours on free days starts at an early age. Changing early school start times could adjust social demands to the biological rhythm of children.FCT projects: PTDC/PSI-EDD/120003/2010, hosted at the Univ. of Aveiro. PTDC/PSI-ESP/32581/2017 and CENTRO-01-0145-FEDER-032581, hosted at the Univ. Coimbra, FPCEUC. CINEICC R&D Unit2020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/100926http://hdl.handle.net/10316/100926https://doi.org/10.1016/j.sleep.2019.06.024eng13899457https://doi.org/10.1016/j.sleep.2019.06.024Clara, Maria InêsAllen Gomes, Anainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-07-20T20:36:27Zoai:estudogeral.uc.pt:10316/100926Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:18:12.661562Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
title An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
spellingShingle An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
Clara, Maria Inês
Pre and primary school children; Pubertal transition; School start times; Sleep phase delay; Sleep schedules and durations
Child
Child, Preschool
Circadian Rhythm
Cross-Sectional Studies
Female
Humans
Male
Portugal
Sleep
Sleep Stages
Surveys and Questionnaires
Time Factors
Epidemiologic Studies
Schools
Students
title_short An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
title_full An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
title_fullStr An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
title_full_unstemmed An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
title_sort An epidemiological study of sleep-wake timings in school children from 4 to 11 years old: insights on the sleep phase shift and implications for the school starting times' debate
author Clara, Maria Inês
author_facet Clara, Maria Inês
Allen Gomes, Ana
author_role author
author2 Allen Gomes, Ana
author2_role author
dc.contributor.author.fl_str_mv Clara, Maria Inês
Allen Gomes, Ana
dc.subject.por.fl_str_mv Pre and primary school children; Pubertal transition; School start times; Sleep phase delay; Sleep schedules and durations
Child
Child, Preschool
Circadian Rhythm
Cross-Sectional Studies
Female
Humans
Male
Portugal
Sleep
Sleep Stages
Surveys and Questionnaires
Time Factors
Epidemiologic Studies
Schools
Students
topic Pre and primary school children; Pubertal transition; School start times; Sleep phase delay; Sleep schedules and durations
Child
Child, Preschool
Circadian Rhythm
Cross-Sectional Studies
Female
Humans
Male
Portugal
Sleep
Sleep Stages
Surveys and Questionnaires
Time Factors
Epidemiologic Studies
Schools
Students
description Objective. It has been assumed that during adolescence there is a strong shift toward eveningness chronotype, whereas children's sleep is relatively stable. Several studies have focused on the conflict between school start times and adolescents' circadian rhythms; however, fewer studies have been conducted in younger children. The aim of this study was to examine sleep durations, schedules, and sleep phase shift in preschool- and school-aged children. Methods. Data for sleep patterns on school days and free days (ie, days when children's sleep−wake patterns were free from any influence of individual or family activities) was obtained by means of questionnaires (Children ChronoType Questionnaire) for 3155 Portuguese children 4–11 years of age. Results. As children grew older and school grade level increases, we found later bedtimes and sleep onsets on both school days and free days; and later wake times only on free days. By contrast, wake times were progressively earlier, imposed by school start times. There was a progressive reduction in the amount of sleep on school nights as grade level increased. Greater social jetlag, later midpoint of sleep, and higher restriction−extension patterns were found across age groups. Conclusion. The displacement of bed and wake times for later hours on free days starts at an early age. Changing early school start times could adjust social demands to the biological rhythm of children.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/100926
http://hdl.handle.net/10316/100926
https://doi.org/10.1016/j.sleep.2019.06.024
url http://hdl.handle.net/10316/100926
https://doi.org/10.1016/j.sleep.2019.06.024
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 13899457
https://doi.org/10.1016/j.sleep.2019.06.024
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instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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