Influence of light exposure at nighttime on sleep development and body growth of preterm infants
Yosuke Kaneshi1, Hidenobu Ohta2, Keita Morioka1
1Maternity and Perinatal Care Center, Hokkaido University Hospital, N15, W7, Kita-ku, Sapporo 060-8638, Japan.
Insights
Brief nighttime light exposure using special red LED lights does not disrupt circadian rest-activity patterns or weight gain in preterm infants. This ensures proper development even with necessary medical interventions.
Area of Science:
- Neonatal care
- Developmental pediatrics
- Sleep science
Background:
- Light-dark cycles are crucial for sleep and weight gain in preterm infants.
- The impact of brief nighttime light exposure for medical care on these benefits was previously unknown.
Purpose of the Study:
- To investigate if brief, imperceptible red light exposure at night compromises the benefits of a light-dark cycle in preterm infants.
- To assess the effects of nighttime nursing care light exposure on infant development.
Main Methods:
- Preterm infants (<36 weeks gestational age) were exposed to either white or red LED light at night within a light-dark cycle.
- Infants' activity, crying, and weight were monitored continuously.
- A special red LED light (>675 nm) imperceptible to infants was used in the experimental group.
Main Results:
- No significant differences were found in rest-activity patterns between the white and red light groups.
- Nighttime crying and body weight gain showed no significant variations between groups.
- Brief light exposure (<15 minutes) during nursing care did not impede circadian pattern development or growth.
Conclusions:
- Periodic, brief nighttime light exposure for nursing care does not negatively affect preterm infant development.
- Maintaining a regular light-dark cycle is sufficient to promote circadian rest-activity patterns and proper growth.
- Imperceptible red light is a viable option for nighttime medical interventions without compromising infant development.
Abstract:
Previous studies have demonstrated that a light-dark cycle has promoted better sleep development and weight gain in preterm infants than constant light or constant darkness. However, it was unknown whether brief light exposure at night for medical treatment and nursing care would compromise the benefits brought about by such a light-dark cycle. To examine such possibility, we developed a special red LED light with a wavelength of >675 nm which preterm infants cannot perceive. Preterm infants born at <36 weeks' gestational age were randomly assigned for periodic exposure to either white or red LED light at night in a light-dark cycle after transfer from the Neonatal Intensive Care Unit to the Growing Care Unit, used for supporting infants as they mature. Activity, nighttime crying and body weight were continuously monitored from enrolment until discharge. No significant difference in rest-activity patterns, nighttime crying, or weight gain was observed between control and experimental groups. The data indicate that nursing care conducted at 3 to 4-hour intervals exposing infants to light for <15 minutes does not prevent the infants from developing circadian rest-activity patterns, or proper body growth as long as the infants are exposed to regular light-dark cycles.
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