Being tired at work is acceptable to CASA. That is why they give dispensations to some operators against CAO 48. Early starts, day or night rosters and long days are now the norm. Any sleep professional will tell you that it runs against nature. CAO 48 worked well before the accountants got at it. Of course the 'fatigue management' systems will save you from going to work tired and off your game! Hahahahahaha!!!!