We all take special care to protect our eyes from the sun’s harmful UV rays; but what about the harmful effects of blue light rays?
Usage of blue light emitting gadgets before bedtime prolongs the time it takes to fall asleep, delays the circadian clock, suppresses levels of the “darkness hormone” melatonin.
Sources of blue light include the sun, digital screens (TVs, computers, laptops, smart phones and tablets), electronic devices, and fluorescent and LED lighting.
As the day progresses, we actually move closer to the back lit devices
Impact on Sleep:
Digital Screens emit blue light which are so bright that at night, brain gets confused by that light. Blue wavelengths—which are beneficial during daylight hours because they boost attention, reaction times, and mood—seem to be the most disruptive at night. This causes the brain to stop producing melatonin, a hormone that gives body the “time to sleep” commands. Because of this, digital screen light can disrupt sleep cycle, making it harder to fall and stay asleep.
Changes in sleep patterns can in turn shift the body’s natural clock, known as its circadian rhythm. Studies have shown that shifts in this clock can have devastating health effects because it controls not only our wakefulness but also individual clocks that dictate function in the body’s organs. Research also shows that it may contribute to the causation of cancer, diabetes, heart disease, and even obesity.
Eyes and Blue Light: