The CEO should be spoken to by the appropriate authority.
All Ops manuals will have a line that runs, “a pilot must not operate when fatigued’.
Easy to say when sat in my armchair, but until crew have the guts to call Ops and tell them they are fatigued then nothing will change.
And yes, I have done it myself, and I know of the pressure that follows. I also speak as someone who kept fit and avoided the parties down-route. So I also know why some complain of ‘fatigue’.