You gave us quite a few tags, but the one you left out is what OS you are using on your Mac. (Syncing is automatic, or can be, with Mountain Lion, but not with Lion.) I must say that iWork syncing can be troublesome at times as with many new and complicated technologies. I'd suggest that you try using Notes to jot down your ideas, letting them sync to your Mac, and then when you get back to your Mac, just Copy them from Notes and Paste and Match Style in to your Pages document. That way you won't inadvertently mess up your Pages work while riding the bus.