It seems that not only do the FDTL's need to be re-evaluated and pilot's schedules arranged accordingly in the case mentioned, but i tend to agree with what has been said regarding the taking of controlled naps. I think in the public eye it is not viewed in the context of what it is.. pax hearing a pilot took a nap would be alarmed naturally, thinking the plane is unmanned, without actually realising that there is another fully qualified pilot at the controls at the same time. However if the other crew member is in control during a cruise phase of flight (understandably not during takeoff/landing), everything should be fairly routine.
I can understand the long haul flights getting tedious when you have 5 hours till you land, but i would be interested to hear how the short-haul pilots doing several legs a day manage to cope with their fatigue. Flying, regardless whether long haul or short haul, can be draining.
