Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.
BTW, I don't think one can really tell ahead of time, unless you're keeping a good log. I now know several symptoms that go along with my (hypo-)mania. One is being warm and needing less clothes. Another one is averting the gaze from strangers I pass by on the street. It varies like that, and you have to find your own. Of course, I start to take longer to fall asleep, I wake up more easily, I dream louder (if that makes sense to you), and this is ON extra medication.