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The Influence of Light on Premature Babies - Nurse monitors cycled lighting in the nicu for premature baby

The Influence of Light on Premature Babies

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Many people find it difficult to sleep in bright light. However, as late as the 1980s, harsh lighting was often used in neonatal intensive care units (NICUs),1 negatively affecting our most vulnerable patients. Today, we know that when it comes to premature babies, light is a very complex matter. Too much exposure and brightness can be extremely damaging to a newborn’s development, but cycled lighting in the NICU can exert a positive influence on growth. Therefore, it’s important to closely control and manage UV light for premature babies in the NICU environment.

Using adjustable lighting in the NICU

Protecting our newborns from intense light

The more premature the baby, the more sensitive to light they are – but in all cases, continuous bright lighting should be avoided. A supportive light environment helps to reduce levels of cortisol, extends sleep duration, stimulates the release of growth hormones and encourages the early development of a circadian rhythm.2,3 Today, three approaches are commonly used in the NICU:

  • Cyclical light exposure: usually has a night time phase and a daytime phase of 12 hours each 
  • Adjustable dimmed lighting: the light is turned down whenever the baby is asleep
  • Continuous dimmed lighting: the light is always dim
Premature baby holds adult finger in the NICU

The benefits of cyclical light exposure

Cycled lighting, imitating the circadian rhythm, has been shown to be the most beneficial approach. Babies exposed to cyclical lighting show better growth and hormone regulation. They are less anxious, cry less, sleep better and are more active during the day.4,5 Some studies show that continuous dim light may, in fact, be just as bad as continuous bright light.

The underlying idea for the constant dim light approach is that it’s also dark in the uterus. However, a fetus does experience a rhythm due to increased activity, higher noise levels and different lighting during the day and night. In addition, a minimum amount of light is necessary for staff to carry out reliable work – for example, when measuring skin color during jaundice checks. Continuous dim lighting can also lead to higher stress in parents and staff spending nights in the neonatal unit.7

Nurse adjusts light for baby in the NICU

A complex matter: Getting NICU lighting right

Because of the unequivocal benefits premature babies get from cycled lighting, there are now clear recommendations for introducing it into NICUs. The light should be infinitely adjustable within the range of 10 to 600 lux and spotlights should be used for individualized lighting. However, it’s not always easy to implement such practices in day-to-day clinical practice. 

The direction of light, the thickness of the incubator walls, whether the incubator is open and the type of cover it has all play a role in how much light the babies are actually exposed to – and so it becomes a difficult job to accurately estimate this.

the influence of light on premature babies

A deeper look of ThermoMonitoring

Premature babies are sensitive to light. The more premature the baby, the more this applies. At the same time, it is not enough to simply dim the light; this is a complex topic.

Read more on this topic


1 Boo NY, Chee SC, Rohana J. Randomized controlled study of the effects of different durations of light exposure on weight gain by preterm infants in a neonatal intensive care unit. Acta Paediatr. 2002;91:674-9
Graven SN. Early neurosensory visual development of the fetus and newborn. Clin Perinatol. 2004;31(2):99-216
Rivkees SA. Emergence and influences of circadian rhythmicity in infants. Clin Perinatol. 2004 Jun;31(2):217-28
4 Guyer C, Huber R, Fontijn J et al. Very preterm infants show earlier emergence of 24-hour sleep-wake rhythms compared to term infants. Early Hum Dev. 2015 Jan;91(1):37-42
5 Borniger JC, McHenry ZD, Abi Salloum BA, et al. Exposure to dim light at night during early development increases adult anxiety-like responses. Physiol Behav. 2014 Jun 22;133:99-106

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