what a load of bull**** this all is.
the greatest risk is the microsleep in hot weather ending up hitting a tree.
the casa medical started out after the second world war when they realised that the civilian pilots could be called up to save the bacon of the RAAF.
Donald Anderson decided that all civilian pilots would pass an RAAF medical so that they could be immediately drafted into the RAAF in the event of war breaking out again.
from that simple start the whole medical empire has grown to employ "thousands" and run the world.
does it actually achieve much. doubt it.
the pilots who fail the medical all drive home through the traffic without incident.
the real question is "can you still be functional at the end of a 3 hour flight and land safely?"
I doubt that a CASA medical would ever be able to determine that.
a sip of water and a few barleyscotch lollies probably work more wonders than all the CASA medicals ever will.
of course if you actually have some health issues why arent you seeing your GP?