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Cited by 337Sleep and related disordersSleep and Wakefulness ResearchCircadian rhythm and melatonin

Sleep and sleep habits from childhood to young adulthood over a 10-year period

Thorleifsdottir, B, Björnsson, J.K, Benediktsdottir, B, Gislason, Th, Kristbjarnarson, H·2002·Journal of Psychosomatic Research
DOI 10.1016/s0022-3999(02)00444-0
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Abstract

The aim of this epidemiological study was to utilise a cross-sectional as well as a longitudinal approach to examine sleep habits and how they develop in young people in Iceland. The 668 subjects (1-20 years) who responded to a postal survey in 1985 were followed up 5 and 10 years later. The majority of the variance in bedtime and sleep duration was explained by age, but also to a considerable degree by other factors such as residence, season, and year of survey or interaction of these factors. Natural phenomena, such as the diminution of total sleep duration in the first years of life and the tendency for longer sleep on weekends compared to weekdays were confirmed. The lengthening of sleep on weekends was first significant at the age of 9 and was greater among adolescents than young adults. The incidence of daytime sleepiness increased in adolescence, as did napping, at which time their nocturnal sleep time significantly decreased. Over a period of 10 years, a significant shift to earlier wake-up times occurred in children up to 15 years of age, which resulted in a shortened total sleep time. The idea that individual sleep duration is an inherent parameter is supported by the high positive correlation of total sleep time across a 10-year period (r=.73). The present data confirm that Icelandic adolescents (aged 11, 13, and 15) have delayed bedtimes and shorter nocturnal sleep compared to European peers.

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  • In Iceland over 70% of individuals between the ages of 16-21 reported frequent daytime sleepiness.

    “In Iceland over 70% of individuals between the ages of 16-21 reported frequent daytime sleepiness [188].”

    From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [188]

  • In other cultures, similar developmental timing is observed, although the peak delay may occur as early as 15-16 years of age.

    “In other cultures, similar developmental timing is observed, although the peak delay may occur as early as 15-16 years of age [45, 163, 188, 209].”

    From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [188]

  • Teenagers maintain later (delayed) bedtimes than younger children, even when wake times are constrained by school or work.

    “Many studies indicate that teenagers maintain later (delayed) bedtimes than younger children, even when wake times are constrained by school or work (Figure 1, [45, 62, 188]).”

    From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [188]

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Authors
Thorleifsdottir, B., Björnsson, J. K., Benediktsdottir, B., Gislason, T., & Kristbjarnarson, H.
Affiliations
National University Hospital of Iceland (IS)
Corresponding author
Gislason, Th
ORCID
Thorleifsdottir, B
Venue
Journal of Psychosomatic Research
Publisher
Elsevier BV
Published
2002-07
Volume
53
Issue
1
Pages
529-537
ISSN
0022-3999 (ISSN-L)
DOI
10.1016/s0022-3999(02)00444-0
OpenAlex
W2030265437
Cited by
337
References
21
Citations by year
2026: 2 · 2025: 5 · 2024: 11 · 2023: 13 · 2022: 11 · 2021: 18 · 2020: 31 · 2019: 12 · 2018: 14 · 2017: 15 · 2016: 24 · 2015: 21 · 2014: 23 · 2013: 17 · 2012: 18
FWCI
8.11
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Journal of Psychosomatic Research (publishedVersion)
  • PubMed (publishedVersion)
  • Hirsla (Landspítali University Hospital) (submittedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Keywords
sleep habits, sleep duration, bedtime, wake-up time, sleep onset delay, daytime sleepiness, napping, adolescents, young adults, children
MeSH terms
Adolescent, Adult, Child, Child, Preschool, Circadian Rhythm, Cross-Sectional Studies, Female, Follow-Up Studies, Habits, Humans, Disorders of Excessive Somnolence, Infant, Ireland, Male, Surveys and Questionnaires, Sleep, Cohort Studies, Sleep Disorders, Circadian Rhythm

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