Mode Night Shift appeared in macOS Sierra
About a year ago in the mobile operating system iOS 9.3 the function of Night Shift, which allows you to change the color temperature of the display, thereby reducing eye strain of the user.
Now, however, Apple made available Night Shift for computers and laptops that are running the operating system macOS Sierra (available in beta 10.12.4).
When mode is activated, there is a sifting of the blue part of the spectrum of light, resulting in a computer in the dark is more comfortable, but subsequent sleep is more qualitative.
While that is a beta version of macOS Sierra 10.12.4 available only to developers, but soon it will be released to all users.