Over exposure to various sources of artificial blue light may be affecting peoples’ ability to get a good night’s rest.
As a bit of an insomniac myself, I found this article very interesting:
“While light of any kind can suppress the secretion of melatonin, blue light does so more powerfully. Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours vs. 1.5 hours).
In another study of blue light, researchers at the University of Toronto compared the melatonin levels of people exposed to bright indoor light who were wearing blue-light–blocking goggles to people exposed to regular dim light without wearing goggles. The fact that the levels of the hormone were about the same in the two groups strengthens the hypothesis that blue light is a potent suppressor of melatonin. It also suggests that shift workers and night owls could perhaps protect themselves if they wore eyewear that blocks blue light. Inexpensive sunglasses with orange-tinted lenses block blue light, but they also block other colors, so they’re not suitable for use indoors at night.
What you can do:
- Use dim red lights for night lights. Red light has the least power to shift circadian rhythm and suppress melatonin.
- Avoid looking at bright screens beginning two to three hours before bed.
- If you work a night shift or use a lot of electronic devices at night, consider wearing blue-blocking glasses.
- Expose yourself to lots of bright light during the day, which will boost your ability to sleep at night, as well as your mood and alertness during daylight.”
Eyewear that filters out 100% of blue light, like Cocoons with orange lenses, may be able to help.
Source: www.Health.Harvard.edu. To learn more check out the full article here: http://www.health.harvard.edu/newsletters/Harvard_Health_Letter/2012/May/blue-light-has-a-dark-side/
Addressing the same issue, HOYA has developed and launched RechargeTM, an anti-reflective lens treatment that reflects the harmful blue light away from the eyes.
“Several studies as well as data from OSHA and ISO, all show there are hazards associated with the High Energy Visible (HEV) Blue Light portion of the light spectrum. Blue light, including HEV Blue Light, is emitted from hand-held devices such as smart phones and tablets. Symptoms as diverse as sleep disorders in children and adolescents, headaches, blurred vision, and fatigue can be due to exposure to blue light radiating from hand- held digital equipment.”