Don't talk just because you are bored. Be interested, interesting, and take a hint about where the conversation is going. There's nothing wrong about saying hi, making a small bit of small talk, to judge if someone else is as conducive to a conversation as you are.
Invading personal boundaries is a no-no, unless you are living in some dream-ilke, movie-like situation where there are no feaks, bad breath, body odor, or snoring. Falling osleep on someone also makes you about as vulnerable as you can be to that person -- is that what you want on a bus ride?
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less I say, smarter I am
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