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Human Illumination: Removing Blue Wavelengths, Circadian Lights Improve Sleep
Aug 13, 2018

A few days ago, Denmark conducted an experiment to test the effect of circadian lights on sleep.


In the neurological wards of Aarhus University Hospital and Copenhagen University Hospital, a specially designed circadian rhythm lamp was installed, which removed the blue wavelength at night and produced an amber hue.


The 26 nurses working under these lights reported that their sleep quality was better than the control group using conventional white lighting. All nurses must have a night shift at least once a week.


It is reported that the experiment was carried out in cooperation with Chromaviso, based in Aarhus, which provided a human-induced lighting system.

This latest Danish study alone does not fully demonstrate the sleep effect of eliminating blue light. As Aarhus clinical care expert Leanne Langhorn said, "We have received different opinions in the research, so the results are not clear."


However, combining all the feedback, the circadian rhythm system does induce a better sleep pattern, and avoiding blue light at night can help sleep.


Leanne Langhorn said, “Nurses exposed to circadian lighting generally have better sleep, they are more likely to fall asleep and sleep more calmly. They usually wake up more easily in the morning than in the control group, after three days of circadian illumination I feel more energetic."


However, in this study, some nurses reported that the amber circadian rhythm lights made them tired during night shifts because they needed to stay awake during night shifts.


Lone Mathiesen, a nurse at the University Hospital in Copenhagen, said that some people feel tired at night because they need white light. Therefore, they opened a white light in another room as needed.