Do yourself a favor and bring a pillow for the ride. Especially for long international flights, those dinky ones they sometimes provide you with doesn't help at all and you'll be wishing you had one.

I've flown from CA to South Korea, New York, Seattle, Mexico, Paris, Paris to Barcelona, Barcelona to Madrid and a bunch more short flights like from LA to SF or LA to Vegas. Never once enjoyed flying. At one point I swore never to fly again. It's exhausting traveling that way. Reading in planes or cars gives me a headache so I rely mostly on in-flight movies and an ipod full of episodes of whatever show I'm currently watching. On the Spain trip we watched a lot of Big Bang Theory which helped the time go by. On the return flight Del Murder and I watched like 4 movies, Taken, Yes Man, Marley and Me, He's Just Not that Into You. But yeah, sleeping is extremely uncomfortable unless you have a nice cushy pillow to rest your head on.