Yeah, I do that sometimes and it really is amazing the difference between high temperature and low. I completely forget that I'm even using it unless I make the conscious effort to to remember that it's on. You're welcome, glad I could help.
Shut up.
Just set your location, set the night time temperature to something low (that you're comfortable with, you'll get used to it after a few nights), and then f.lux should do the rest. You can also set your transition speed to slow so that it doesn't shock you when it changes, and if you're lucky, you won't even notice it changing unless you remember that you've got it installed. I have mine set to 2700K at night due to eye strain issues, but that's the lowest it goes and can look really weird if you're not used to it. I'd suggest starting off at 4000K and getting used to that, then lowering it from there if you feel like it it's not low enough.