Talking to Who?

My roommate tells me I talk to myself a lot.  She says she has to keep coming out to see if somebody else is here.  I knew I did it a little, but apparantly I talk to myself a lot more than I'm aware of.  I found myself doing it again yesterday.  I guess that's what happens after 3 years of living alone.  I don't see it as such a bad thing.  After all, one of my favorite people, my grandma, talks to herself.  I guess it runs in the family. :-)  The only thing is, my roommate is a psych major so I bet she has all sorts of ideas about why I do it.