Exposure to blue light at night, emitted by electronics and energy-efficient lightbulbs, harmful to your health.

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.

Want to know more, click on this link:http://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side