Most of my 13-hour legs have been overnights, and I just pretend to sleep for long stretches, but usually only manage to doze intermittently. Watch the best movie first, because I know my interest in watching will wane as the flight goes on. I usually take a couple of new magazines or a book, and do some reading. Somewhere in mid-flight I generally make the mistake of looking at the screen route map, just to confirm that we are lost in mid-ocean in the middle of the night, hours from anywhere. At this stage, I generally get a glass of wine, stare at the map for an hour and listen to music on the headphones. When I realise that we are still hours from anywhere, and still lost in the dark in mid-ocean, I pretend to sleep again. Since I have matured (the past 2 years), I generally only have a pre-dinner drink and a wine with the meal, apart from the mid-ocean soother, and this helps when we eventually arrive at the destination, usually as the sun is about to rise.
Last year I did Vancouver-Seoul in daylight, and that was great for the frist five or six hours, but after that, tick all the above boxes....except it's harder to pretend to sleep in the middle of the day.
And even after 13 hours in Business Class, you arrive with wild red eyes, a bad hair day and a rank growth that on anyone else would be designer stubble.
Just the way you want to be to face customs, immigration, sniffer dogs and a bright new day!
But must admit, the first few hours, while you are fresh, and the food and wine are there to be enjoyed, it is pretty good!!
"...every aircraft is subtly different.."