It can also be handy to have a bluelight filter. If on x11, you can use redshift. While there is also a gtk version, as well as configuration to have it auto-switch like flux, I just use the manual way.

redshift -O will set a desired color temperature, and -x cancels. I bound it to Mod+audio keys, but the choice is yours.

bindsym $mod+XF86AudioNext exec redshift -x
bindsym $mod+XF86AudioPrev exec redshift -O 4000