Blue Light And Melatonin Production
The blue light that s emitted from these screens can delay the release of sleep inducing melatonin increase alertness and reset the body s internal clock or circadian rhythm to a later schedule. As soon as the body gets the signals that the day is ending i e it s time to sleep the body starts producing melatonin to help us do that.
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Blue light whether from the sun or a laptop is very effective at inhibiting melatonin production thus reducing both the quantity and quality of your sleep 15 16.
Blue light and melatonin production. Light prevents the production of melatonin through primitive ganglion cells in our eye s retinas two percent of which we have recently learned are photosensitive. These photosensitive ganglion cells are activated at or have a peak sensitivity to particular blue wavelengths which does not match the same peak sensitivities of the retinal scotopic rod cells or blue sensitive cone color cells. 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.
Melanopsin is triggered by specific wavelengths of light and is most sensitive to wavelengths at and around 480 nm or in layman s terms primarily blue wavelengths. Studies link melatonin suppression in the evening to various health problems including metabolic syndrome obesity cancer and depression 17. 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.
When melanopsin receptors in our eyes absorb light with blue wavelengths it suppresses the production of melatonin promoting alertness. To add to that blue light also stimulates your brain and affects the production of melatonin. The sleep hormone melatonin is the reason why we get sleepy at around the same time every night.
Research has found that exposure to blue light suppresses the production of melatonin more than any other type of light. It is believed that the shorter wavelengths in blue light is what causes the. Blue light suppresses melatonin production for more than twice as long as other light wavelengths and alters circadian rhythms by twice the degree.
Interference with the body s 24 hour circadian rhythms can have a significant effect on health creating problems with the cardiovascular metabolic. This is an especially big problem for teens whose circadian rhythms are already shifting naturally causing them to feel awake later at night.
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