I vote for Blondie's #4.
Of course you'd have to get those nose thingees to prevent snoring noises. zzzzZZZZZZzzzzzzZZZZZzzzzz
I know shorthand, so what I did is pretend to be taking notes. Instead, I was writing "stupid idiots" "lies" "WTS sucks" "brother ---- wears ugly clothes" and stuff like that, but no one could read it. It got me through.
I used to offer to let toddlers sit with me just so I could pretend to take them to the bathroom or for walks when I claimed they were about to cry.
Once I made a point of changing my seat multiple times. I'd get up and pretend to be going to the bathroom and just go sit somewhere completely different. If you walk purposefully and briskly, the attendants don't realize you're wandering around. My mother couldn't keep track of where I was. It was like a game. Once she'd find me, she'd come to get me, and I'd be moving elsewhere.
Another time as a teen, I spent at least an hour picking lint off my sweater and carefully placing the lint on the head of the person sitting in front of me (complete stranger). The woman couldn't feel what I was doing and ended up with a nicely arranged collection of lint balls in her hair. I was silent giggling so bad my stomach hurt. Then someone behind me burst out laughing really loud and blew the whole thing. The lint-ee was not amused. Back to shorthand. sigh