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Studies have shown that exposure to bright blue light in the evening can affect your circadian rhythms and make it harder to fall asleep. Night Shift uses your computer's clock and geolocation to determine when it's sunset in your location. It then automatically shifts the colors in your display to the warmer end of the spectrum. In the morning it returns the display to its regular settings.

How to set up Night Shift

Make sure that your Mac meets the system requirements for Night Shift, then follow these steps:

1. Choose Apple menu  > System Preferences.
2. Click Displays.
3. Click the Night Shift tab.
   

Schedule: Create a custom Night Shift schedule or have Night Shift turn on automatically from sunset to sunrise.

Manual: Control Night Shift manually.

• If Night Shift is off, select the checkbox to turn Night Shift on until 7 a.m. If you're using a schedule, Night Shift automatically turns off at the scheduled time.
• If Night Shift is on, deselect the checkbox to turn Night Shift off. If you're using a schedule, Night Shift turns on again at the scheduled time.

Color Temperature: Drag the slider to make the color temperature more or less warm when Night Shift is on. Warmer color temperatures show more yellow and less blue.

System requirements for Night Shift

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Night Shift requires macOS Sierra 10.12.4 or later and one of these Mac computers, using the built-in display or the displays listed:

• MacBook models from early 2015 or later
• MacBook Air models from mid 2012 or later
• MacBook Pro models from mid 2012 or later
• Mac mini models from late 2012 or later
• iMac models from late 2012 or later
• Mac Pro models from late 2013 or later
  

• Apple Pro Display XDR
• Apple LED Cinema Display
• Apple Thunderbolt Display
• LG UltraFine 5K Display
• LG UltraFine 4K Display
  

Learn more

• How to use Night Shift on your iPhone, iPad, or iPod touch.
• You can use True Tone and Night Shift at the same time.

Before rebuilding the Spotlight index

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• Follow the steps for when Spotlight returns unexpected results.
• If you're having difficulty finding items in the Mail app, follow the steps to rebuild Mailboxes in Mail.

Rebuild the Spotlight index

1. Choose Apple menu  > System Preferences, then click Spotlight.
2. Click the Privacy tab.
3. Drag the disk or folder that you want to index again to the list of locations that Spotlight is prevented from searching. Or click the add button (+) and select the disk or folder to add.
   
   You can add an item to the Privacy tab only if you have ownership permissions for that item. To learn about permissions, choose Help from the Finder menu bar, then search for “permissions.”
4. From the same list of locations, select the disk or folder that you just added. Then click the remove button (–) to remove it from the list.
   
5. Quit System Preferences. Spotlight will reindex the contents of the disk or folder. This can take some time, depending on the amount of information being indexed.