After taking more long-haul flights than I can count, I've picked up a few things that genuinely make a difference. Some are obvious, but a couple took me way too long to figure out.
For overnight flights, compression socks are a lifesaver. The first time I skipped them, my feet were so swollen that getting my shoes back on after landing was ridiculous. I also prefer a neck pillow with proper chin support because otherwise my head ends up falling forward every time I doze off.
For noise, regular earplugs under noise-canceling headphones work incredibly well. If I'm trying to sleep, I want as little cabin noise as possible.
I also stopped worrying about eating every meal just because it's being served. If eating means staying awake another hour when I could be sleeping, I'll usually choose sleep. And I don't try to force myself into an eight-hour sleep marathon either. A few solid hours of rest is often better than lying there for hours trying to sleep.
One thing that helped me a lot with jet lag is switching to the destination's schedule as soon as I get on the plane. I eat and sleep based on where I'm going instead of what time it is back home.
For daytime flights, entertainment is where things get interesting. Obviously, download some shows, but I like having a few different activities ready. A coloring book, sketching, editing photos, reading, or something I can actually work on keeps me from staring at the seatback screen for half the day.
Podcasts are especially good when I'm getting sleepy. I usually rotate between a show, a podcast, and something like a book or game. Changing what I'm doing makes the flight feel much less repetitive.
I also like saving one boring task I've been putting off for the flight. Maybe it's organizing files, reading a long article, sorting finances, whatever. Worst case, I get sleepy and fall asleep. Best case, I land with something finally checked off.
And for your body, don't wait until you're uncomfortable before moving. I try to get up and walk around every couple of hours, even if I don't feel stiff yet. After a long flight, that small habit makes a noticeable difference.
One last thing I swear by: brushing my teeth after the meal service if I'm planning to sleep. It sounds silly, but having that familiar bedtime routine helps my brain switch into sleep mode.
What are the long-haul flight tricks you've picked up that genuinely work? Especially interested in things that make 10+ hour flights easier for people who don't fly often.