The Mt Gambier accident pilot had similar problems and also struggled with nights and it resulted in a fatal accident.
I challenge you to show me someone who doesn't struggle with nights! It's not the individual nights that hurt, it's the long term effects (year in, year out) that I am concerned about.
Maybe the RFDS should consider 2 crew ops for late night if guys can't stay awake....
This is the one thing I would like to see before I finish my career, from what I understand even third World countries operate two pilots (at night) on aeromedical operations. Who knows, this may even be a catalyst for change!