As I see it (and please shoot me down if you disagree) the main failing of CAP371 is that it assumes that all people are the same all of the time. There are no compensations for the fact that some people are early birds whilst some are night owls. If you are a night person then fatigue is going to set in far sooner if you are on a run of earlies than if you are a natural early bird. Vice versa also holds true. I am far better in the mornings so prefer an early start time over late evenings/nights. But then I'm not a flyer so my opinions don't really count!
