Sorry for probably a repeat thread but I can't find this answer:

Can someone tell me or post a thread link describing what percentage of your flying is in the circadian low, 2am-5am?

Basically what I want to know is, if someone's main bid preference is to not be awake at 3am, how many 3am flights are they going to end up working before their seniority can get them out of it? Assume that 3pm on the other side of the world still counts as 3am.

Are there some pilots who come to FedEx and then find out that they actually can't handle the schedule and quit?

Lastly, if anyone cares to go more in depth, is there anything you wish you had known about the job before you started?

Thanks in advance.