idk mate, I just decide to sleep and eventually I do.

I've never been on a long flight, but on overnight Amtrak routes I can only sleep with earbuds and music

For me it's the gentle lullof the motor and mild sway of the plane. I just can't stay awake if I try

1-2mg of Melatonin, remain motionless with eyes closed for ~20 minutes, you'll be out like a light. Make sure you take a smaller dose - most gummies are 5 or 10 mg, it honestly works better if you subdivide.

I rarely sleep longer than 90 minutes at a time, unless I'm physically exhausted already. And yes, the neck hurts, but exhaustion hurts more.

I once read somewhere that it's something to do with the altitude or the cabin air pressure that make people feel sleepy.

Personally. I can't do it and I find it very uncomfortable even trying to get to sleep on those long journeys. Even if I do fall asleep, hoping to paas the time and it ends up not being long and time has never passed.

Alcohol makes me sleepy, so I'll drink a little and then listen to rainstorms with my headphones.

The one time I slept in a plane for more than an hour was when I wrapped my head in a blanket and had an empty seat next to me to lean on.

Benzos

Zopiclone, mostly.

Those little neck pillows they board the plane wearing.

Idk I can't sleep on planes either.

I've been on, like, fewer than 50 flights, so I don't think I've slept on one.

Watch a movie on the in-flight entertainment. I can never finish a movie on a plane. No matter what I do, I fall asleep. If I don’t watch anything, I can’t sleep.

Business class lie flat seat for long haul flights. Tickets are insanely expensive.. fortunately I have a ton of air miles from company travel. Once you try it there's no going back.

Diphenhydramine, melatonin, neck pillow, and EYE MASK. Critical to block out light. Bonus for noise cancwlli headphones playing noise.