2. Lighting conditions for cycled light versus continuous bright light.

Reference	Intervention	Daytime light intensity	Night‐time light intensity
Mann 1986	Cycled light	Lit by bright fluorescent strip lights	Windows were covered with dark, lined curtains, lights were turned out and the only illumination was provided by a low‐intensity night light
	Continuous bright light	Lit by bright fluorescent strip lights that remained permanently on
Miller 1995	Cycled light	Range 156‐201 lux	Range 20‐32 lux
	Continuous bright light	Range 172‐232 lux	Range 206‐274 lux
Vásquez‐Ruiz 2014	Cycled light	Range 249 ± 11 lux	Light/dark condition was achieved by placing from 19:00 to 07:00 an acrylic helmet, covered with blue surgical drapes; surgical cloths were placed on helmets, and the frontal part was open, allowing good airflow. This helmet was placed individually above the head and thorax of each baby, resulting in reduced illumination, with light intensity of 27 ± 0.8 lux at the level of the eyes
	Continuous bright light	Range 249 ± 11 lux