Sleep quality, cortisol levels, and behavioral regulation in toddlers

Anat Scher*, Wendy A. Hall, Anat Zaidman-Zait, Joanne Weinberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study examines the association between nighttime sleep characteristics and cortisol levels and how these variables relate to aspects of children's temperament and behavior. Twenty-seven healthy children, aged 12-36 months, attending group childcare settings, participated in the study. Each child's sleep was measured at home with actigraphy over three nights. Saliva samples were collected by the mothers at bedtime and within 30 min of awakening. In addition, both the mother and the daycare teacher rated the child's behavioral difficulties and negative emotionality. It was found that children with more fragmented sleep displayed higher awakening cortisol levels compared to children with more efficient sleep. Moreover, elevated awakening cortisol levels were correlated with teachers' ratings of internalizing behavior and negative emotionality. These preliminary findings suggest that awakening cortisol may serve as a useful index of adrenocortical reactivity in young children, signaling a disturbance in physiological regulation, and underscore the need for more research pertaining to the dynamic associations between sleep and HPA-axis across the 24-hr period.

Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalDevelopmental Psychobiology
Volume52
Issue number1
DOIs
StatePublished - Jan 2010
Externally publishedYes

Keywords

  • Awakening cortisol
  • Daycare
  • Fragmented sleep
  • Temperament

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