If you use your computer before going to bed, you owe it to your eyes to turn on Night Shift on your Mac. The feature, which adjusts the color of your display to the warmer end of the light spectrum after sundown, eases eye strain and can make falling asleep easier.
Night Shift dials down the amount of blue light emitted by your display. Studies have shown that exposure to blue light, which makes images look bright and crisp, can have adverse effects during nighttime use of electronics: Getting too much blue light after dark can make it more difficult to drift off to sleep.