Fatigue:Self Reporting
The onus is on the employee to recognize and report fatigue.
This means that if the employee recognizes fatigue either in themselves or another employee it must be reported.Failure to do so means that the employee is culpable in the event of a safety related incident.
The reporting of fatigue is to be treated "with compassion and confidentiality".
Report fatigue too often and it will be indicated to you,that in the interests of your well being perhaps you should seek alternative employ.So rather than accept fault with company rostering the blame will apportioned to the employee.
Hence the "toughen up princess" proclamation from above