Sleep quality, cortisol levels, and behavioral regulation in toddlers

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Anat Scher1, Wendy A Hall, Anat Zaidman-Zait

  • 1Faculty of Education, Department of Counseling and Human Development, University of Haifa, Haifa, Mount Carmel 31905, Israel. anats@construct.haifa.ac.il

Developmental Psychobiology
|November 19, 2009
PubMed

Insights

Fragmented sleep in young children is linked to higher cortisol awakening levels, which correlate with internalizing behaviors. This suggests cortisol may indicate physiological regulation issues in children.

Area of Science:

  • Pediatric Sleep Medicine
  • Child Psychology
  • Endocrinology

Background:

  • Nighttime sleep quality is crucial for child development.
  • Cortisol levels reflect the body's stress response and the hypothalamic-pituitary-adrenal (HPA) axis activity.
  • Understanding the interplay between sleep, cortisol, and behavior is vital for early intervention.

Purpose of the Study:

  • To investigate the association between nighttime sleep patterns and cortisol levels in young children.
  • To examine the relationship between sleep, cortisol, and children's temperament and behavior.
  • To explore cortisol awakening response as a potential biomarker for physiological dysregulation.

Main Methods:

  • Actigraphy was used to objectively measure sleep efficiency and fragmentation over three nights in 27 children (12-36 months).
  • Salivary cortisol samples were collected at bedtime and upon awakening.
  • Mothers and daycare teachers completed behavioral and emotionality rating scales.

Main Results:

  • Children with more fragmented sleep exhibited higher cortisol awakening levels.
  • Elevated cortisol awakening levels were positively correlated with teacher-reported internalizing behaviors and negative emotionality.
  • These findings suggest a link between poor sleep, HPA-axis activity, and behavioral challenges.

Conclusions:

  • Awakening cortisol may serve as a sensitive indicator of adrenocortical reactivity in young children.
  • Disturbed sleep and elevated cortisol may signal underlying physiological regulatory problems.
  • Further research is needed to elucidate the 24-hour dynamics of sleep and HPA-axis function in children.

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