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.
pacman -S redshift
[redshift] fade=1 gamma=0.8 temp-day=5700 temp-night=3500 location-provider=manual [manual] lat=32.0610 lon=118.7916
systemctl --user enable --now redshift.service