I found that if I fly at night, I have to MAKE myself sleep 8 hours+ to feel good. I usually wake up around 12:30 - 1:30pm and am tired but not tired enough to keep sleeping. If I just lay there and make myself sleep a few hours, it is not too bad. I am pretty new to this though....we'll see how the next 29 years goes (if the job lasts that long).