At night, reading on your phone tires your eyes.
Falling asleep becomes more difficult after staring at the phone screen for long periods of time at night.

why? Because of the blue light. Studies have found that blue light can make people more excited and make it harder to fall asleep at night.

Eye Care: Blue Light Filter are used by the monitor to shift the colors to the warmer end of the color spectrum to reduce blue light. This may help you get a better night's sleep.