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Updated: Aug 25, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
[Prevalence and stress factors of sleep disorders in children starting school]
Susanne Kraenz1, Leonie Fricke, Alfred Wiater
1Klinik für Psychiatrie u. Psychotherapie des Kindes- u. Jugendalters der Universität, Robert-Koch-Strasse 10, 50931 Köln. susanne.kraenz@medizin.uni-koeln.de
Insights
A study found that 15% of school-novices experience insomnia and 14% have nightmares. Establishing a consistent sleep-wake schedule significantly reduces sleep problems and daytime sleepiness in children.
Area of Science:
- Pediatric Sleep Medicine
- Child Psychology
- Epidemiology
Context:
- Limited international research exists on sleep disturbances in preschool and school-aged children.
- The Cologne Children's Sleep Study investigated sleep patterns in a representative sample of school-novices in 2002.
Purpose:
- To determine the prevalence of insomnia and parasomnia in young children.
- To explore the relationship between sleep problems and sleep hygiene, health factors, and behavioral issues.
- To examine the correlation between disturbed sleep and environmental factors like light and noise.
Summary:
- High prevalence of insomnia (15%) and nightmares (14%) reported by parents.
- Sleepwalking, night terrors, and daytime sleepiness were less common.
- Consistent sleep-wake schedules were associated with fewer sleep onset difficulties and less daytime sleepiness.
- Disturbed sleep showed a 2-3 times elevated risk for hyperactivity and emotional problems.
Impact:
- Highlights the need for diagnostic clarification of sleep disturbances in children.
- Underscores the importance of intervention programs for children with behavioral difficulties and sleep impairments.
- Provides valuable data for public health initiatives and clinical practice in pediatric sleep health.
Abstract:
Epidemiological studies of sleep disturbances in preschool and school-aged children are under-represented in international clinical research. Based on this fact we investigated the prevalence of insomnia and parasomnia in a representative sample of school-novices in Cologne in 2002 (Cologne Children's Sleep Study). We have also considered the relationship between sleep problems on the one hand and sleep hygienic variables, physical and somatic healthy factors and behavioral problems on the other. A high prevalence of insomnia problems (15%) and repeated nightmares (14%) in children of this age were found in parent's report. Thereas sleep-walking, night terrors and daytime sleepiness were reported less frequently. Children having a solid sleep-wake-schedule show significant less problems to fall into sleep and feel sleepy during the day. Moreover we focused the correlation between disturbed sleep and multiple influencing, as light irritating and noise. We found a two- to three times elevated risk for hyperactive and emotional problems for children with insomnia or parasomnia complaints with regard to the comorbidity of behavioural difficulties. These findings underline the necessity for diagnostic clarifying of sleep disturbances and intervention programs for behavioural disturbed and isolated sleep impaired children.
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