I used to behave bipolar, enough to get diagnosed as cuh and experience it realistically as such, only when I believed I was bipolar. Do you get what I mean? I suspect it's more of a self-fulfilling prophecy that follows from black and white thinking. My periods hypomania are probably better explained as periods of anxiety that put me into flow states, coupled with sleep deprivation from obsessive behaviour like surfing the web then getting not very much sleep. In fact, I dare say its one of the worse psychometrically and statistically defined illnessness. Ironically, ADHD gets the most flak when it's probably the best defined one (the question is instead whether its a disability or not). I dont identify with bipolar states and I quite simply don't get them anymore. I'm no longer considered 'diagnosed' with bipolar. I'd be more skeptical if I were you.