Taking up the philosophical issues... or rather biological issues... of the graveyard shift... I have been on that working... and it is not a problem for a body that is kept fit... The only problem I know is when one burns both sides of the candle... then I'd think you may have issues... (Well, I know you have issues, because, like other sailors I've sinned on that line!)
Otherwise, as long as one sleeps 7 to 8 hours a night (or a day) you are okay... (How else would one philosophically sustain a sacred lore such as "la siesta de la tarde" and "la fiesta en la disco hasta las cinco..."??