If you are a type of person who need to give strain on your eyes by staring at your computer or laptop screen for hours every day and night and sometimes while working at night, you must have feel uncomfortable and started adjusting the system display settings to make your eyes feel comfortable and again in morning you need to set it back to the normal settings.
So instead of doing this almost every day you can give a try to F.lux. F.lux is a free app which automatically controls and adjusts the display of your screen every day and night, according to your location and time set on your computer. Or you can manually set your location by entering the latitude and longitude.
When its day time it will keep your screen display cooler and at night when sun goes down (sunset) it will make your screen warm. In starting you may not like it but you can change the settings temporarily, so that you can get comfortable with. You will find settings in system try of your task bar.
If you feel that it is changing color too fast then you can change the settings and make the transition slow. For sure this is app not for people like designers or someone who looks for accuracy in color display on their screen. However this app has an option to disable it for an hour.