Night Light feature in Windows 10 - reduces "blue light"
If you are concerned about the health impact of "Blue Light" (the light that comes from a PC monitor, tablet, mobile phone, TV), then there is a filter built into Windows 10 that you may wish to enable.
Windows 10 has a Night Light setting which gently reduces the monitors blue-tones, giving the screen a warmer look. This can be manually switched on and off, or you can set it to automatically adjust to sunset and sunrise.