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Updated: Jun 13, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
Sleep patterns and their age-related changes in elementary-school children
Wan Seok Seo1, Hyung-Mo Sung, Jong Hun Lee
1Department of Neuropsychiatry, Yeungnam University, Daegu, Republic of Korea. sws3901@ynu.ac.kr
Insights
Children
Area of Science:
- Pediatrics
- Sleep Medicine
- Child Development
Background:
- Assessing sleep patterns in children is crucial for understanding developmental and health outcomes.
- Variations in sleep duration and timing can impact cognitive function and well-being.
- Understanding factors influencing children's sleep is essential for public health initiatives.
Purpose of the Study:
- To evaluate children's bedtime, wake-up time, total sleep duration (TSD), sleep latency, and daytime napping by age and gender.
- To compare sleep duration based on various demographic and lifestyle factors in children.
Main Methods:
- A cross-sectional study involving 3639 children in Daegu, Korea.
- Sleep parameters including bedtime, wake-up time, TSD, sleep latency, and napping were analyzed.
- Comparisons were made across different age groups, genders, and lifestyle factors.
Main Results:
- Significant age-related variations were observed in bedtime and TSD, with older children sleeping less.
- No gender differences in sleep parameters were found.
- Napping decreased until age 9, then increased; housing type, extracurricular activities, and screen time influenced sleep duration.
Conclusions:
- Older children experience shorter sleep durations primarily due to later bedtimes.
- Socio-cultural factors, high levels of nighttime and recreational activities, and excessive academic pursuits may contribute to late bedtimes.
Objectives:
This study aimed to evaluate children's bedtime, wake-up time, total sleep duration (TSD), sleep latency, and daytime napping by age and gender. Its secondary aim was to compare sleep duration among demographic and lifestyle factors.
Methods:
We performed a cross-sectional study of 3639 children in Daegu, Korea, comparing bedtimes, wake-up times, TSDs, daytime naps, and sleep latency according to age and gender, as well as comparing sleep duration according to the children's demographic and lifestyle factors.
Results:
Bedtime and TSD varied significantly by age. But wake-up time differences were not as large, as the differences in bedtimes and TSDs. There were no gender differences in any sleep parameters. The percentage of the children who took naps decreased until age 9 and began increasing again at age 10. Children who lived in apartments got less sleep than did those living in other types of housing. Extracurricular academic activities, duration and timing of television-watching, and computer playing were also related to the children's sleep duration.
Conclusions:
Older children sleep less than younger children; the main reason is late bedtimes. Late bedtimes may be due to socio-cultural factors, high levels of nighttime and recreational activities, and/or excessive academic activities.
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