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Sleep architecture is related to birth season in 1-month-old infants

Anja Kärki1, E Juulia Paavonen2,3, Anna-Liisa Satomaa1

  • 1a Department of Clinical Neurophysiology, Tampere University Hospital, Medical Imaging Centre and Hospital Pharmacy, Pirkanmaa Hospital District , Tampere , Finland.

Chronobiology International
|July 4, 2019
PubMed

Insights

Infant sleep patterns vary by birth season. Summer-born infants had more active sleep and less transitional sleep, impacting their total sleep time and awakenings.

Area of Science:

  • Pediatrics
  • Sleep Medicine
  • Chronobiology

Background:

  • Infant sleep architecture shows significant individual variability.
  • Environmental and genetic factors are implicated but not fully understood.
  • Seasonal influences on infant development are increasingly recognized.

Purpose of the Study:

  • To investigate the impact of birth season on infant sleep architecture.
  • To determine if seasonal light exposure at birth correlates with specific sleep stages.

Main Methods:

  • Eighty-five healthy 1-month-old infants participated in overnight polysomnography (PSG).
  • Infants were grouped into four seasonal cohorts based on light levels at birth: increasing light (spring), light (summer), increasing darkness (autumn), and dark (winter).
  • Sleep architecture, including stage R (active) and stage T (transitional) sleep, was analyzed.

Main Results:

  • Infants born in summer exhibited the highest amount of stage R sleep and the lowest amount of stage T sleep.
  • Winter-born infants showed the lowest amount of stage R sleep and the highest amount of stage T sleep.
  • Summer-born infants had shorter total sleep time (TST) and fewer awakenings.

Conclusions:

  • Birth season significantly modifies infant sleep architecture.
  • Seasonal variations in light exposure may influence early sleep development.
  • This study provides the first PSG evidence linking birth season to distinct infant sleep patterns.

Keywords:
Polysomnographybirth seasoninfant polysomnographyinfant sleepseasonalitystage R sleepstage T sleep

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