Related Experiment Video
Updated: Aug 12, 2026
Chronic Sleep Deprivation in Mouse Pups by Means of Gentle Handling
Published on: October 11, 2018
The effects of hyperbilirubinemia on sleep-spindle characteristics in infants
Dolunay Gürses1, Ilknur Kiliç, Türker Sahiner
1Department of Pediatrics, Pamukkale University Faculty of Medicine Denizli, Turkey. dolunayk@yahoo.com
Insights
Jaundice in newborns, known as hyperbilirubinemia, can alter sleep spindle characteristics. These changes in sleep patterns may indicate early neurophysiologic brain alterations in infants.
Area of Science:
- Neonatal neurology
- Sleep science
- Neurophysiology
Background:
- Hyperbilirubinemia, a common condition in newborns, involves elevated bilirubin levels.
- Sleep spindles are crucial for brain development and function.
- The impact of hyperbilirubinemia on sleep spindle characteristics is not fully understood.
Purpose of the Study:
- To investigate the effect of hyperbilirubinemia on sleep spindle characteristics in infants.
- To determine if hyperbilirubinemia can abolish or alter rhythmic sleep activities.
Main Methods:
- Electroencephalogram (EEG) records were obtained from infants with hyperbilirubinemia and healthy controls at 12 weeks postpartum.
- Sleep spindles were analyzed for location, density, duration, amplitude, frequency, asynchrony, and asymmetry.
Main Results:
- Infants with hyperbilirubinemia exhibited lower spindle density and shorter spindle duration compared to controls.
- A significant difference in spindle frequency was observed, with lower frequency in the hyperbilirubinemia group.
- The percentage of asynchronous spindles was higher in infants with hyperbilirubinemia, correlating positively with bilirubin levels.
Conclusions:
- Hyperbilirubinemia significantly alters sleep spindle characteristics, including density, duration, frequency, and synchrony.
- These alterations suggest potential neurophysiologic brain changes in infants with jaundice.
- Monitoring sleep spindle patterns may serve as an early diagnostic tool for at-risk infants.
Objective:
The purpose of this study is to investigate the effect of hyperbilirubinemia on sleep-spindle characteristics. Rhythmic activities, such as sleep spindles, may be abolished by hyperbilirubinemia.
Study Design:
Electroencephalogram records were taken from 15 infants with hyperbilirubinemia and 18 healthy infants at the 12th week after birth. Sleep spindles of the 2 groups were compared according to location, density, duration, amplitude, frequency, asynchrony, and asymmetry.
Results:
In the study and control groups, the density of the spindles was found to be 76.9 +/- 23.7 and 105.2 +/- 33.9, respectively, in a 1-hour non-rapid eye movement sleep period. The mean durations of the sleep spindles in the study and control groups were found to be 4105 +/- 802 milliseconds and 5162 +/- 1075 milliseconds, respectively. There was not any difference between the groups according to the amplitude and asymmetry. However, there was a significant difference between the 2 groups in the frequency of spindles. The mean frequency was found to be 12.5 +/- 0.6 Hz in the study group and 13.2 +/- 0.9 in the control group. The percentage of asynchronous spindles was higher in the study group than in the control group. There was a significant negative correlation between the bilirubin levels during the newborn period and density, duration, and frequency of spindles. However, there was a significantly positive correlation between the bilirubin levels and percentage of asynchronous spindles. There was a significant negative correlation between the duration of hyperbilirubinemia and spindleamplitude.
Conclusion:
We suggest that studies on the critical maturation periods of sleep-spindle patterns might provide a sensitive tool for early diagnosis of neurophysiologic brain alterations during the first trimester of life in a population of at-risk children, such as jaundiced infants.
