Install if You Use Your Mac at Night
Do you use your Mac at night or in the evening? If so, then you should install the macOS Sierra 10.12.4 update since it will help you use your computer and still be able to go to sleep.
Similar to the options on the iPhone and iPad, there is now a Mac night mode. Officially this is called Night Shift, and it changes the color temperature of the Mac screen to show less blue light. This helps when using the Mac at night as it will allow you to transition from computer use to sleep easier. This is very similar to the f.lux application.
Open the Notification Center on your Mac by swiping in from the right with two fingers, pull down on the notification area slightly and you will see Night Shift right above Do Not Disturb.