Sleep duration in preschool children and impact of screen time
Abstract
Objectives To evaluate sleep duration in a representative sample of preschoolers and examine the relationships between screen time and use of different electronic media devices with sleep duration and social jetlag. Methods 2903 preschoolers were included. Parent-completed questionnaire provided information on socioeconomic status, electronic media use of the children and sleep patterns of both parents and children. Preschoolers were divided according to whether they met the international screen time recommendations for their age. Comparisons between the two groups in various sleep measures and effects of different devices on sleep were evaluated. Results 40% of preschoolers in our cohort did not achieve the recommended sleep duration. Subjects who adhered to the screen time recommendations were from families of higher socioeconomic status, had longer sleep duration and better sleep habits. Each hour increase on portable electronic device use was associated with 11 (95%CI: -15 to -6) and 6 (95%CI: -10 to -2) minutes less of average daily sleep duration in boys and girls, respectively. Every additional hour of non-portable electronic devices use was associated with 3 min shift in social jetlag in boys. Presence of electronic devices in bedroom and their use at bedtime increased risk of social jetlag in boys with an OR of 1.40 (95%CI: 1.01 to 1.92) and 1.39 (95%CI: 1.00 to 1.95) respectively. Conclusion A significant proportion of preschoolers does not obtain the recommended am…
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Every additional hour of non-portable electronic device use is associated with a 3-minute delay in social jetlag for boys.
“Lan (33) indicated that every additional hour of non-portable electronic device use was associated with a 3-minute delay in social jetlag for boys.”
From The association of screen time and the risk of sleep outcomes: a systematic review and meta-analysis. (2025) · cites this paper as Lan (33)
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Mallawaarachchi, S. R., Anglim, J., Hooley, M., & Horwood, S. (2022) · Early Childhood Research Quarterly · doi:10.1016/j.ecresq.2021.12.008 · Cited by 62 · see citing works
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“Lan (33) indicated that every additional hour of non-portable electronic device use was associated with a 3-minute delay in social jetlag for boys.”
- Authors
- Lan, Q.-Y., Chan, K. C., Yu, K. N., Chan, N. Y., Wing, Y. K., Li, A. M., & Au, C. T.
- Affiliations
- Chinese University of Hong Kong (HK)
- Corresponding author
- Au, Chun T.
- Venue
- Sleep Medicine
- Publisher
- Elsevier BV
- Published
- 2020-12
- Volume
- 76
- Pages
- 48-54
- ISSN
- 1389-9457 (ISSN-L)
- OpenAlex
- W3090521074
- Cited by
- 63
- References
- 13
- Citations by year
- 2026: 5 · 2025: 14 · 2024: 12 · 2023: 15 · 2022: 14 · 2021: 3
- FWCI
- 7.73
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Sleep Medicine (publishedVersion)
- PubMed (publishedVersion)
- Funders
- from the Research Committee of the Chinese University of Hong Kong (2019.071)
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Education › Child Development and Digital Technology
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Keywords
- sleep duration, preschool children, screen time, electronic media use, social jetlag, portable devices, bedtime screen use, socioeconomic status, sleep recommendations, circadian rhythm
- MeSH terms
- Screen Time, Child, Preschool, Female, Habits, Humans, Male, Surveys and Questionnaires, Sleep, Jet Lag Syndrome
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