no, that really does work, at least it seems so for me; I have it set to the default settings but if I'm working late and feeling tired I switch it off and enjo

no, that really does work, at least it seems so for me; I have it set to the default settings but if I'm working late and feeling tired I switch it off and enjoy the "brightness kick". One of the greatest features of f.lux for me is that I actually start feeling more tired after it kicks in, so it really does encourage me to get to bed earlier.