Related Experiment Video
Updated: Dec 23, 2025

Noninvasive, High-throughput Determination of Sleep Duration in Rodents
Published on: April 18, 2018
Sleep duration on a population of children referred to sleep study - cross-sectional data from 2003 to 2009
Cristiane Fumo-Dos-Santos1, Marcia Pradella-Hallinan1, Beatriz Neuhaus Barbisan2
1Universade Federal de São Paulo, Departamento de Psicobiologia - São Paulo - São Paulo - Brazil.
Insights
Children aged 7-13 sleep longer on weekends. Factors like age, school schedules, and sex influence sleep duration and weekend/weekday differences in sleep patterns.
Area of Science:
- Pediatrics
- Sleep Medicine
- Child Psychology
Background:
- Sleep is vital for children's development and well-being.
- Insufficient sleep in children is linked to physical and psychological issues.
- Understanding pediatric sleep patterns is crucial for addressing sleep-related problems.
Purpose of the Study:
- To describe nocturnal sleep patterns in children aged 7–13 years.
- To investigate the influence of sex and weekdays on children's sleep habits.
- To analyze factors associated with sleep duration and weekend-weekday sleep differences.
Main Methods:
- Retrospective cross-sectional study utilizing questionnaires from children with sleep complaints.
- Data collected from December 2003 to June 2009 in Sao Paulo City, Brazil.
- Analysis included median sleep hours, bedtimes, wake times, and differences between weekend and weekday sleep using a generalized linear model.
Main Results:
- 577 children analyzed (median age 9.5 years, 61% boys).
- Median sleep duration was 9.5 hours on weekdays and 10 hours on weekends.
- Shorter weekday sleep was associated with older age and school schedules; longer weekend sleep was associated with older children, girls, and school schedules.
Conclusions:
- Children aged 7–13 typically sleep more on weekends than weekdays.
- Age, school schedules (morning/full-time classes), and sex (girls) are associated with variations in sleep duration and weekend-weekday sleep patterns.
- Findings highlight the impact of age, school demands, and sex on pediatric sleep habits.
Introduction:
Sleep is essential for human beings, especially children. Insufficient sleep is linked to somatic and psychological problems. This study aims to describe nocturnal sleep patterns in children aged 7 to 13 years and investigate if sex or weekdays influence sleep habits. It also analyses factors associated with sleep length and the difference between sleep habits on weekends and weekdays.
Methods:
A retrospective cross-sectional study with questionnaires from children with sleep complaints referred to our service (December 2003 to June 2009) in Sao Paulo City, Brazil. Median of sleep hours, time going to bed, waking up, and the difference in amount of sleep during weekends and weekdays were calculated. A generalized linear model was used to find associations between covariates and a) sleep hours, and b) sleep weekend minus - weekdays.
Results:
We analyzed 577 children (median 9.5 y, 61% boys). Median bedtime was 22h. Median wake up time was 7h on weekdays and 9h on weekends. Median sleep duration was 9.5h during weekdays and 10h on weekends. The median difference in the amount of sleep during weekends and weekdays was 0.5h (IQR=1.5). Shorter sleep duration was associated with age and school schedule. Higher difference weekend - weekdays was associated with older children, girls, and school schedule.
Conclusion:
Children 7 to 13 years usually sleep more on weekends. Age, morning and full-time classes are associated with shorter sleep duration on weekdays and higher weekend-weekdays; girls sleep more during weekends.
Related Concept Videos
Longitudinal Research
Stages of Sleep
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Longitudinal Studies
Insufficient Sleep and Sleep Deprivation
Sleep deprivation is a more severe form of sleep loss...
Cross-Sectional Research

