The recently released apple iOS 9.3 operating system received the night mode that allows to change the color temperature, thereby sparing the user's eyes when working with a mobile device in the dark. Something like this should appear on the Android N.
To activate this feature, the user must go to the hidden settings . Next, you should go to System UI Tuner, then in the Color and Appearance, and select Night Mode. The function can be activated and deactivated manually or select automatic mode. In the latter case, the device will switch itself on Night Mode depending on the time of day.
By the way, night mode has already been tested on Nexus 9, where it's a little buggy, which is not surprising, since this is an experimental option.