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So the trick is finding out what is causing the behavior I’m seeing on all three Macs. Update: most readers report not seeing this issue MPG suspects it depends on some kind of system configuration, such as an ACL, user/group database, etc.īug are bugs and often depend on some factor or factors that might leave some users high and dry even as others happily snorkel along. See also About the macOS Sierra 10.12.4 Update. Night Shift can also be toggled on manually using the Notification Center or Siri.- SEND FEEDBACK Related: 4K and 5K display, Apple, Apple Core Rot, Apple macOS, computer display, iMac, iMac 5K, Mac Pro, passphrase, security, sudo, terminal

It can also be set to turn on and off at custom times. Night Shift is activated through the Displays section of System Preferences, where a setting to have it come on at sunset and turn off at sunrise is available. Blue light is believed to interrupt the circadian rhythm, disrupting sleep patterns. Night Shift, first introduced on iOS devices in iOS 9.3, is designed to gradually shift the display of a device from blue to a subtle yellow, cutting down on exposure to blue light. MacOS Sierra 10.12.4 brings iOS's Night Shift mode to the Mac for the first time. The update can be downloaded using the Software Update function in the Mac App Store. MacOS Sierra 10.12.4 is a free update for all customers who are running macOS Sierra. macOS Sierra 10.12.4 has been in testing since January 24, with Apple having seeded eight betas ahead of its public release. Apple today released macOS Sierra 10.12.4, the fourth major update to the macOS Sierra operating system that launched on September 20.