I would caution on melatonin. I use it. Love it. Swear by it. I do not take any sleep medications that sedate but melatonin is not sedating. It simply adjusts our brain to BE READY to go to sleep.
My word of caution: Homeopathic, herbal and "natural" drugs are not FDA regulated. Consequently there is no regulation on what does or does not go into that pill or powder that is sold. Some herbal drugs have recently been found to
contain high levels of lead, for example. Some will have no trace of the advertised drug but will instead use a self-coined alternative.
I use a major brand-name (Walgreens, CVS, etc.). never anything bought on the web. I also take it about 10 hours before I need to be fully awake, especially if I have eaten in the last four hours.
p.s. for me:
1) melatonin
2) earplugs (ALWAYS) and $8 store bought eyemask
3) snacks and water under seat in front of me
4) window seat to avoid being disturbed
5) adjust sleep/wake day before to simulate destination
6)pillow and blanket(s)
------------------
"Oh heck, bring me a quad."