Originally Posted by
hotturnip
This is an issue for Miss Manners, not Flyertalk.
"Pardon me for interrupting ma'am, but I was really hoping to use this time to rest. Would you mind if we didn't converse right now? Thank you so much."
I agree. The same thing hold true for a chatty seatmate. Any frequent flyer should know how to say "Nice chatting with you, but now I'm getting back to my book, sleep, my music, movie, daydreaming, whatever."