Until the advent of artificial lighting, the sun was the major source of lighting, and people spent their evenings in (relative) darkness. Now, in much of the world, evenings are illuminated, and we take our easy access to all those lumens pretty much for granted.
We are surrounded by gadgets within and outside of our bedrooms and some of us fall asleep while gazing at these devices. For more on the effects of blue light on your health, please click on this link: http://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
Have a good night, y’all 😀