Beer has froth - PIMMS doesn't
Thanks for the support Tiramasu and Pappi
It is always better if I'm posters fully read what is said in a post rather than picking their own limited selection.
The point is -
Crew should be aware they are ALLOWED to be tired &/or sick, but -
it is their legal responsibility to make the aircraft commander aware of any personal limitations as to their fitness to operate.
Is this not an important flight safety/CRM issue? You should not operate (or maintain) an aircraft when unfit for whatever reason. One's personal duty of care actually encompasses other crew members and passengers as any professional would understand.