The question I would ask you is, can you fall asleep at 12:30 am then get up at 2:30 am and go fly for another few hours. I can, and I find those small cat-naps really work well for me. Others here say that if they fall asleep, they have a difficult time waking up and they're groggy for awhile. It really boils down to how you handle this. Also for myself, I'd rather be tired and flying at night than deal with Whining pax, flight attendants, gate agents etc. Also remember one thing, All it takes is one jackass terrorist on a mission to send the pax carriers back into a post 9/11 downturn, whereas here, not so much. Also really look at our retirement...no brained there.
Good luck