Trial Tested Eye Masks for Premature Babies
Researchers investigated whether simulating natural sleep cycles could improve development in preterm infants.
Updated on Oct. 7, 2026 in Babies
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Should hospitals implement circadian rhythm interventions like eye masks and ear plugs for premature babies?
Since 2019, the Circa Diem study has tested the effects of using eye masks and ear plugs on 869 premature babies in neonatal intensive care units across Australia and New Zealand. The research aims to see if protecting infants from constant light and noise helps stabilize circadian rhythms.
Why it matters
Premature infants often lack natural day-night light cycles while in hospital, which researchers hypothesize may contribute to long-term developmental complications. This study explores whether a low-cost, $60 intervention can mitigate the effects of environmental disruptions.
The Circa Diem study, which began in 2019, is a controlled trial of 869 premature infants across 11 centers in Australia and New Zealand. Participants were assigned to either a control group or an intervention group fitted with eye masks and ear plugs to simulate natural sleep cycles.
The players
National Health and Medical Research Council
An Australian government agency that funded the expansion of the study.
The details
The intervention works by blocking out artificial light and noise in hospital neonatal units to better support the infants' developing circadian rhythms. By shielding these babies, researchers hope to compensate for the loss of maternal influence and natural cycles that normally signal sleep and wake patterns. The procedure is performed under constant monitoring to ensure infant safety.
Timeline
The Circa Diem study began in Western Australia in 2019.
First results of the study are expected to be presented in November 2026.
Health Landscape
The Circa Diem study investigates the role of circadian rhythm management in neonatal care, marking a departure from traditional light and noise exposure in intensive care units. This research addresses the evolution of medical science in prioritizing sensory protection for the most vulnerable patients.
This study evaluates whether low-cost environmental changes can protect premature infants from developmental risks during hospital stays. Families with infants currently in neonatal care should discuss the latest findings on sensory stimulation and sleep environments with their clinical team.
The takeaway
Simulating a natural day-night cycle for premature infants may prove to be a highly cost-effective intervention for supporting long-term health. Future findings from the Circa Diem Kids follow-up study will offer further insight into developmental health in children aged five to eight.
What happens next
The initial results of the Circa Diem study are scheduled to be presented in November 2026.
Further reading
Learn more about the latest research and care guidelines for Babies.
Source note: This article includes information reported by The West Australian.
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Should hospitals implement circadian rhythm interventions like eye masks and ear plugs for premature babies?
