I don't know whether you've experienced chronic fatigue, but from your comments on this thread it looks like you haven't. It is dramatically more debilitating than you seem to give it credit for. (I haven't personally suffered from CFS, but I know people who have. Additionally, I have experienced months of insomnia which resulted in my being unable to do pretty much anything - lack of sleep is truly crippling - and I can only presume that CFS makes you feel much worse in a wide variety of ways.)