The more I travel, the less enamoured I am with airports and layovers. The IAH-NRT flight was a godsend when I was living in the US and working in Vietnam. My poor opinion of Qatar economy cattle cars to the UK is tempered by their thankfully shortish Doha layovers. A couple of ~6 hour flights back-to-back with just enough time to change gates is almost perfect. Before the Ukraine ruckus queered their pitch, Finnair's +11 hour non-stop in Business Class was great with KLM's similarly lengthy jaunt via Hamsterjam a close second even in Coach as that's a decent airport to kick back for a few hours.
My 'trick' for long haul flights is to stay awake as long as possible in the 24-hours before departure. Check-in, board and drag yourself to your window seat but tell the crew supervisor you do NOT want to be wakened up to eat. I'm fast asleep before push back and awake and refreshed well before the serial movie, nap and a crap breakfast crowd block up the bathrooms before landing.
Airplanes are for sleeping in, but you need to be tired. Airports are for passing through, but you need to be wide awake.