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1. Blue Light Has A Dark Side." Harvard Health Letter 37.7 (2012): 4. Consumer Health Complete - EBSCOhost. Web. 14 Feb. 2016.

 But we may be paying a price for basking in all that light. At night, light throws the body's biological clock—the circadian rhythm—out of whack. Sleep suffers. Worse, research shows that it may contribute to the causation of cancer, diabetes, heart disease, and obesity.

But we do know that exposure to light suppresses the secretion of melatonin, a hormone that influences circadian rhythms, and there's some experimental evidence (it's very preliminary) that lower melatonin levels might explain the association with cancer.

Some studies suggest a link between exposure to light at night, such as working the night shift, to some types of cancer, diabetes, heart disease, and obesity. 

While light of any kind can suppress the secretion of melatonin, blue light at night 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.

2. Study by the Department of Pharmacology and Toxicology and Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA

Elongated exposure to the waves transmitted through screen devices during the evening can disrupt circadian rhythm and cause various health effects including a disruption in normal sleep schedules.

3. Fall Asleep Faster and Sleep Better by Reducing Blue Light Exposure Before Bedtime. Effectiviology. Retrieved 30 December 2016

Many indoor light bulbs contain a blue wavelength light, and when we are exposed to blue light, our body inhibits the release of melatonin, causing us to become more awake. Even the use of computer or phone screens at night can inhibit this release, which in turn can make it hard to fall asleep right away.

4. Hecht, Jeff. "Better Than Sunshine." New Scientist 214.2871 (2012): 42. MAS Ultra - School Edition. Web. 28 Feb. 2016

We respond to blue light even if we cannot see the blue, because our eyes are sensitive to the color blue. With exposure to light both day and night, our melatonin has trouble detecting nighttime, which results in trouble falling and staying asleep.

5. Holzman, David C. "Blue Alert." New Scientist 210.2811 (2011): 44. MAS Ultra - School Edition. Web. 21 Feb. 2016.

In another experiment that evaluated different colors affect on internal clocks at night, blue light was found to set back the clocks the most, twice as much as green light.

According to this article, blue light has been found to be the most detrimental to our sleep schedule and internal clocks when exposed to at night. Overall, absorbing light during the day, as opposed to night, may make a difference in falling and staying asleep.  

The release of melatonin, the hormone that triggers sleepiness, can be inhibited by even the use of computer of phone screens, which in turn can make it hard to fall asleep right away.

Overall, absorbing light during the day, as opposed to night, may make a difference in falling and staying asleep.

6. Sparks, Sarah D. "Does 'Blue Light' Impair Students' Sleep? (Cover Story)." Education Week 33.14 (2013): 1. MasterFILE Premier. Web. 28 Feb. 2016

With continuous use of lamps, computers, and cellphones during the night can lead to about six to eight hours of problematic sleep. Students may find themselves staying up late studying for a test, but research has found impedes memory retention.

A clinical psychological study found that students who were able to fall asleep earlier and sleep more received better grades than students who were unable to get more sleep. Additionally, as technology continues to grow, the sleep time for students decreases. It has been found that the average American sleeps an hour and a half less than the average sleep time half a century ago.

7. Damage of photoreceptor-derived cells in culture induced by light emitting diode-derived blue light

In conclusion, the present findings suggest that the blue LED light can damage the retinal cone photoreceptor cells severely. Antioxidants could potentially be used to improve the retinal photoreceptor cell damage induced by blue LED light.

8. Blue Blocker Glasses as a Countermeasure for Alerting Effects of Evening Light-Emitting Diode Screen Exposure in Male Teenagers

BB glasses may be useful in adolescents as a countermeasure for alerting effects induced by light exposure through LED screens and therefore potentially impede the negative effects modern lighting imposes on circadian physiology in the evening.