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Very preterm infants show earlier emergence of 24-hour sleep-wake rhythms compared to term infants

Caroline Guyer1, Reto Huber2, Jehudith Fontijn3

  • 1Child Development Center, Department of Pediatrics, University Children's Hospital Zürich, CH-8032 Zürich, Switzerland.

Early Human Development
|December 3, 2014
PubMed

Insights

Very preterm infants show earlier 24-hour sleep-wake rhythms than term infants. Exposure to cycled light conditions in neonatal care may promote the development of these rhythms in preterm infants.

Area of Science:

  • Neonatal development
  • Circadian biology
  • Sleep science

Background:

  • Contradictory findings exist regarding the development of 24-hour rhythms in preterm infants compared to term infants.
  • The impact of external time cues, such as light, on infant sleep-wake patterns is not fully understood.

Purpose of the Study:

  • To compare the emergence of 24-hour sleep-wake rhythms in very preterm infants (<32 weeks gestational age) versus term infants at 5, 11, and 25 weeks corrected age.
  • To investigate the effect of cycled light conditions during neonatal care on the development of postnatal 24-hour sleep-wake rhythms in preterm infants.

Main Methods:

  • A prospective cohort study with a nested interventional trial involving 34 preterm and 14 term infants.
  • Preterm infants were randomized to either cycled light (12 hours on/off) or dim light conditions during hospitalization.
  • Sleep and activity were monitored using parental diaries and actigraphy at 5, 11, and 25 weeks corrected age.

Main Results:

  • Preterm infants exhibited longer nighttime sleep and reduced nighttime activity compared to term infants across all measured ages.
  • Preterm infants exposed to cycled light conditions demonstrated the longest nighttime sleep duration.
  • Preterm infants in dim light conditions showed the lowest activity levels.

Conclusions:

  • Very preterm infants develop 24-hour sleep-wake rhythms earlier than term infants.
  • Exposure to external time cues, particularly light, appears crucial for the maturation of infant sleep-wake rhythms.
  • The findings suggest that controlled light exposure in neonatal care may support circadian rhythm development in preterm infants.
Abstract

Keywords:
ActigraphyCircadian rhythmLightPretermSleep

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