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
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | |
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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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 |
status_str |
publishedVersion |
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 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) 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 |
repository.mail.fl_str_mv |
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1799134076935864320 |