I don't think I get this. I can get depressed or down but the mania is much more common. You basically feel like you can do anything, you get over-excited about everything, sometimes a bit angry, then you're head feels like it's going to explode. (I can live with everything except the last bit - that's very annoying)
I get periods when I sort of feel what I guess most people feel like - close to "normal", but the rest of the time it's sort of all or nothing, extremes.