I've never done this before. I'm flying (United) out at 5:50pm from LAX and I land at LHR at 12:15pm.
They'll serve dinner and breakfast. That's all I know. The longest flight I've ever been on has been west coast to east coast.
Do they show movies - do you have to buy the headsets to hear the movie? Is there an official "lights out" time? Do they serve a midnight snack? Can I still read with a night light even after "lights out" (if there is indeed one)? Do they really hand out eye masks? What about "cleaning up" in the morning? Does everyone just make their way to the tiny little bathrooms to freshen up? Should I have some kind of ear plugs?
I'm not usually a nervous nelly, but this is my first transatlantic flight and I'll be by myself - I think being prepared will help a lot.