Obviously you'd like to bring an (inflatable) neck pillow. Even better, the ones with the little beads, very comfy. The Total Pillow is my fav since it folds in all kind of shapes and gives more 'hight' in the neck. Also, I like to place it on my tray table and stick my face in it--- it's one of the only ways I sleep on board (yeah, messed up, I know!).