Framer, I'm not trying to be 'Tougher' than anybody else. I think fatigue is the biggest issue for Long Haul flying and is greatly underestimated. I am guilty of flying when too fatiqued. Making best use of rest time is not easy in Hotel rooms. I don't really have any answers except to take it seriously and rest when ever you can. Incidently, when three crew with SQ, ie one Capt and two F/O's the Capt cannot leave his seat and is only allowed 'controlled rest' in the cockpit. SIN-AKL is an example, 10 hrs in the chair back-of-the-clock. They don't use Second Officers like Qantas do, it's a pilot under training rank.
During my Domestic years a layover was 'party-time' this is not possible on Long-Haul, at least not these days. Long-Haul is fatigue management, simple as that. I have one friend who flew with EVA and just couldn't hack it and gave it away. I managed 15 years of Long-Haul, with difficulty, and would never go back. I've seen pax in economy to Europe, min rest and crew back.