I've already mentioned it in a few other threads, but before I used f.flux I was getting terrible migraines everyday from using my phone at night because the blue light was so harsh on my eyes. After using f.lux I no longer get migraines from using my phone.
So that's why it's a big deal for me.
Give it a shot. It's an amazing tweak. And it's free.
Also add that, even if one doesn't get migraine, he surely gets some insomnia. See http://www.nytimes.com/2011/07/05/health/05light.html?_r=1 and http://www.msnbc.msn.com/id/3682804...s/t/ipad-could-cause-insomnia-researchers-say - two very important articles on this subject.