Experiments at Danish hospital demonstrate that circadian lighting helps sleep.

An experiment was conducted in Denmark to test the effects of circadian rhythms on sleep.

In the Neurosurgery Ward of Aarhus University hospital and University of Copenhagen hospital, a specially modulated circadian lamp was installed, which removes blue wavelengths at night and produces amber tones.

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

It is reported that the experiment was carried out by the hospital in collaboration with Chromaviso, headquartered in Aarhus, which provides the human lighting system.

The latest Danish study itself does not fully demonstrate the effect of blue light elimination. As Leanne Langhorn, a clinical nurse specialist in Aarhus, said, "we have received different views in the study, so the results are not clear."

However, combined with all feedback, the circadian rhythm system does induce better sleep patterns, and avoiding blue light at night helps sleep.

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

However, in this study, some nurses reported that the amber colored circadian lights made them feel tired on the night shift because they needed to stay awake when they were on night shift.

Lone Mathiesen, a nurse at University of Copenhagen hospital, says that some people feel tired at night because they need white light stimulation. So, according to their needs, they opened a white light in another room. (Editor: LED net James)

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