Visible light waves vary in length from 380 nanometers (violet light) to 700 nanometers (red light). Blue light has very short, high energy waves. Because of the dramatic increase in computers, laptops and mobile devices, our exposure to Blue Light has also dramatically increased.
While there is little data on the effects of Blue Light on the retina, there are several studies that show that Blue Light affects the sleep:awake cycles. Blue light waves mimic the light waves found during the daylight hours. Therefore exposure to Blue Light during the evening and night hours affects the release of melatonin (a sleep inducing hormone), which can affect the sleep:wake cycle. Thus exposure to Blue Light at night can make it more difficult to fall asleep.
To reduce exposure to Blue Light, some devices have a Blue Light setting to reduce the amount that is exposed to the individual. There are also Blue Light filters that can be placed across your devices.