1. A pillow
I am not talking about the flimsy one the airline gives you (though I truly appreciated it, and it made a huge difference, so thank you, United). I am talking about a big, comfy pillow that makes anywhere feel like your bed. Yes, I realize that this might be a bit impractical, but I am certainly going to try for my next trip.
2. A toothbrush and toothpaste
This one is the best. When I got to my friends' house in England, my first request was not to take a nap or eat something: I wanted to brush my teeth. No, I needed to brush my teeth. And I have to say that after I did, I felt so much better. My next carry on bag will include these items, and I will be using the plane bathroom for this surprisingly necessary purpose.
3. Extremely strong sleeping pills.
This is rediculous, I know. But economy plane seats are small and don't recline. I took a Benadryl, but there's only so much a little over-the-counter pill can do. (I'm not a druggie; I promise.) Yeah, I guess #3 is probably not happening, but a girl can *dream.
Actually, 1 is entirely impractical. But 2 and 3 are golden.
(*Pun entirely intended.)