First, make sure your Mac is running MacOS Sierra 10.12.4, the fourth major update to MacOS Sierra, which released in September. It is now available as a free over-the-air update and can be downloaded using the Software Update function in the Mac App Store on your Mac. The Night Shift option is located in the Display section of System Preferences. Click on the Apple icon in the menu bar, then select System Preferences, and click the “Displays” icon. You will see three tabs in this menu: Display, Colour, and Night Shift. Select Night Shift. From the “Schedule” option, select either “Sunset to Sunrise” or “Custom”. The “Sunset to Sunrise” option makes Night Shift to turn on each night when the sun sets and turn off when the sun rises based on your local times. To use this option, your location must be enabled under the Security & Privacy Preference. As for the “Custom” option, it lets you choose a start and end time for Night Shift to turn on every day.
