Night Light filters and reduces blue light emission from the screen to protect your eyes.
To turn on the Night Light feature, go to Settings > Display > Night Light. You can also turn on/off Night Light from the Quick Setting’s drop-down menu.
If you want to turn on the Night Light at a scheduled time, go to Settings > Display > Night Light > Tap Schedule and choose the options from the drop-down menu. For the option, Turns on from sunset to sunrise, the time frame of this option is calculated based on the latitude and longitude of the location.
Note: This knowledge is currently only applicable for ZenFone 6. Please stay tuned for further updates on ASUS Official Website.