Firstly, what is blue light?
Blue light is one of the many visible hues on the light spectrum (See Image below)
(I won't get technical on light itself. If you would like background information on light itself a few good YouTube videos explaining it in simple terms
and here -> https://www.youtube.com/watch?v=I024MxO3AF0
Blue-violet light exists naturally and is all around us. Not all blue light is bad for you in fact humans need some blue-violet light from the sun to regulate mood, sleep/wake cycle (circadian rhythm), alertness and sharpen memory. Man made sources include LED or fluorescent lights, TV’s, computer/gaming screens, smart phones, iPads and other digital devices.
You may have heard of melatonin, it is a hormone produced by the pineal gland in the brain that regulates sleep. Research has found that exposure to blue light suppresses the production of melatonin more than any other type of light. Blue light tricks your body into thinking it’s sunlight which slows down the production of melatonin resulting in insomnia or restless night sleep.
In the last few years we have come to find that too much blue light or exposure to it at the wrong times may have hazardous effects not just with sleep but eye damage and overall health.