Researchers looked at the role of specialized photosensitive cells in the retina. The cells, called ipRGCs, are responsible for regulating circadian rhythms. And recent evidence suggests these cells may also play a role in mood and cognition.
To test how nocturnal lighting color affects mood, the researchers exposed hamsters to nighttime conditions of no light, red light, white light or blue light for four weeks each.
Hamsters exposed to red light at night had the fewest brain changes associated with depression in humans, while blue and white light had the worst effects on mood.
Beware: late-night work email may not be the only thing ticking you off—the blue glow of your machine may also be getting you down. The best bet: shut down and get some shuteye.
Article by Annie
Color, even in small items, makes a difference. I have some old red Christmas light bulbs which I will use to replace the white light bulbs now in our nightlights. BBL