No matter what the circumstances IF YOU ARE TIRED AND FATIGUED DO NOT FLY THE TRIP!!!! When they can't man the flights they will change the policy or the proceedure. If you report and fly tired they will just "kick it up a notch" next month! If something should happen during the course of the flight the company will hide behind the FOM. Safety is the most important thing at stake here and I am amazed that after the NRT flight 80 "incident" the company is once again optimizing. It is important for the company to stay profitable but NOT at the expense of flight safety!!