Cargo schedules are in NO way similar to the passenger carriers.
Flying on the back side of the clock incessantly is one of the hallmarks of cargo flying albeit there does exist some daytime flying.
As in any carrier flying, Seniority is the only thing that will keep you from the most ugly of the ugly flying, it might even afford you some daytime flying. There are no flight attendants to serve your meal and coffee, you are able to avoid the TSA nazi folks at the airline terminals unless you find your self catching a jumpseat over there or having to take a scheduled deadhead, but in the end you are a freight dog and worthy only of the beating and terse application of policy and procedure that exists for the sake of your company ...............