Good to know I am not the only one, BeggingTurtle and EsotericInterest. It doesn't scare me or make me worry about bipolar. I always took bipolar to be mood changes and mood cycling with no apparent reason. This happens when I am really happy about something or some things or with lots of "positive" stimulation like WerewolfPoet says. I have had this reaction since I was a kid. I didn't know til recently that the things I do when it happens are stimming behaviors. I think when I was an adolescent these reactions did scare me a little because it felt so out of control or because I felt stupid, like I shouldn't be that happy or do those weird things. So I suppressed it because I didn't want to do those things in front of people like parents, sister, or other people I was around and had a lot more anger and frustration meltdowns because of my mom's reactions (which weren't negative really, but I took them to be that way). It will last about 30 minutes to an hour, depending on the situation, I assume. And then I get very tired and sleepy and then pretty depressed the next day. I used to focus on sad things to control some of this too I think and that may be where the drop comes from, from being conditioned to do so and also just for biochemical and physical reasons.
Dindon, I have the same thing. My husband said it's like I can get high on my own brain. It's a "positive" overstimulation thing in my case. We have azalea bushes in the area that I live in and when I am in that way, it's like those hot pink flowers are glowing against the darker green bushes and it's funny. Stuff like that. He says it's like LSD. And a grape slush with Nerds from Sonic? Yeah, that's like a drug for me.
Bipolar? Maybe. Who knows. Maybe it's more like cyclothymia. I hardly have any other bipolar symptoms. Hope it isn't a precursor though.