This tool is in the Ubuntu software center, so it’s easy to try. I did find I had to make a config file to make it work. Aside from eye strain, it might help you sleep better.

Redshift | jonls devblog

Redshift adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night. This program is inspired by f.lux (read here for the reason why I started this project).