Electroencephalographic sleep macrostructure and sleep spindles in early infancy

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Soraia Ventura1,2, Sean R Mathieson1,2, John M O'Toole1,2

  • 1Department of Paediatrics & Child Health, University College Cork, Cork, Ireland.

Sleep
|November 10, 2021
PubMed

Insights

This study provides normative sleep data for 4-5 month old infants, revealing sex-based differences in sleep spindle spectral power and brain symmetry. These findings offer valuable insights into infant brain maturation and potential biomarkers for neurodevelopmental studies.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Sleep Medicine

Background:

  • Infant sleep patterns are crucial indicators of brain development.
  • Normative data for sleep macrostructure and sleep spindles in early infancy are limited.
  • Understanding these patterns can help identify potential biomarkers for neurodevelopmental outcomes.

Purpose of the Study:

  • To establish normative values for sleep macrostructure and sleep spindles in healthy 4-5 month old infants.
  • To investigate the influence of sex, recording time, and age on these sleep features.
  • To provide a reference dataset for future research on infant sleep and neurodevelopment.

Main Methods:

  • Recruited healthy term infants and recorded daytime sleep electroencephalograms (EEGs) at 4-5 months.
  • Performed sleep staging and analyzed five macrostructure features.
  • Annotated sleep spindles and extracted seven quantitative features for analysis.
  • Examined variations across sex, recording time, infant age, and sleep cycles.

Main Results:

  • Analyzed recordings from 91 infants, detailing sleep duration, REM percentage, and REM latency.
  • Reported median values for sleep spindle features including number, density, frequency, duration, spectral power, brain symmetry index, and synchrony.
  • Observed significant sex-based differences: males had lower spindle spectral power and higher brain symmetry index than females.
  • Found no other significant associations with sex, recording time, or age; spectral power decreased in the second sleep cycle.

Conclusions:

  • The established normative data for infant sleep macrostructure and spindles can serve as a benchmark.
  • These findings highlight sex-specific variations in sleep spindle characteristics during early development.
  • This data is valuable for comparative studies on sleep dysfunction and atypical neurodevelopment in infancy.
Abstract

Keywords:
EEGNREMREMinfantmacrostructurenapneurodevelopmentsleepspindles

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