one thing i found when i went on my flight to LA (thats london to LA, an 11hr flight) is as SOON as you can put your headphones in as loud as you can stand, I didn't put them that loud and I coudl still hear background noises, and people keep coughing on planes I guess cos of the dry air, and every time someone coughed hard I had to get up and walk down the aisles cos I was certain someone had just v* and I for some reason needed to see who it was. They never had, except once on the way back a pregnant lady a few rows ahead of me v* but I think that was some sort of morning sickness thing...
I spent the whole flight feeling very n* but that was just from panic. I was awake every moment of the flight (even though it was a night time flight) just from anxiety haha. And it seems stupid now after the flight cos nothing I was worrying about actually happened!