How is your personality in a dream? How is it different from your waking personality?

I'm sociable and somewhat talkative and slightly 'nervous' in real life. But in my dreams I'm more sophisticated and calm, besides shouting to realise I'm dreaming. Could there be a reason? I know I could just go wild on it, but I'm more neutral on the subject.

What about you? Do you go crazy, or do you just stay quiet? :3