A bus or an airplane is one of the few times that it would not be rude to stay next to someone for hours without saying a single word. Still, I think you could have given conversation at least one more try... You never know.
As for the sleeping thing, unless you guys hit it off, I think it is a bad idea. I always feel that someone else (no matter how cute) invading my personal space is presumptuous. Makes them less attractive instantly.
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Cogito ergo spud -- I think, therefore I yam
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