This is amazing. I had heard about f.lux on windows, which was awesome. F.lux changes the screen to be less blue at night to help your eyes (when you use it, it actually helps). The linux version is bugged and broken and this works a lot better. I just hope that he'll make the gui a little nicer :)
If it doesn't work by default, make sure to start it with the "-l" location flag. gtk-redshift -l