I was thinking about this today because I have a tendency to laugh out loud alot when I'm by myself (and sometimes in public...err) when I think of something that's funny (like today it was the Teenager post on here that did it).
I talk to myself all the time in my head. There's the sensible 'good girl' me who just knows better, then there's the bad girl me who says "Wouldn't it be nice to get hammered tonight?".
Well those two girls duke it out all the time, and boy have they had some serious battles. So the answer to your question is most definitely; and I think it's perfectly normal.
I think what you're doing is 'thinking it through', playing it out, and talking yourself out of it which is very, very good!
