Earlier quoted context omitted.
Thing is, in their mind, they're not rambling. They believe they are saying something intelligible. They have thoughts, sometimes mixed up, and feelings, and try to express them - but something in the delivery smashes it to bits. So the interesting thing to me is how you can read these ramblings and actually extract feelings and intentions from them, even though they make no sense. Usually it's very sad and lonely.
Do you think schizophrenics know of their condition, or are they clueless that there's something biologically wrong with them? To me, that seems to be the hallmark difference between hypomania and "real" mania, and what makes the latter more dangerous and scary-- the loss of insight into the condition, or that there even is anything amiss.
There's a big difference between the three. The first, the ones who know and care about it - you probably won't even notice he/she is suffering from it, unless they tell you. The others.. yeah.
Source: used to be a med student and a trained hospital sitter.