insomnia
"Physician.  Relatively frequent flyer on red-eye flights.

25 mg doxylamine 15 min prior to boarding a red-eye flight cross country or trans-oceanic flights has allowed me to sleep soundly.  Works far better than my previous routine of 50 mg diphenhydarmine (benedryl) plus a glass of wine.   

I recommend this without reservation to any who need to sleep on a flight of this kind.

Only down side is that many... including me... will tend to be somewhat sleepy on arrival, and over the next 8 hours after arrival.   

$12 bought me a life-time supply.  This medication seems to me superior in this application to any other prescription or non-prescription medication.   Used occasionally on red-eye flights to get some good sleep."