Houston, there is a problem

This dream was all over the place. But here goes:

I was out in a field with my parents and brother and I looked up to the sky to watch an airplane fly overhead. It was pretty normal, the whole seeing-an-airplane-in-the-sky thing, so I returned to whatever we were doing in the field. Suddenly the airplane changed into a space shuttle and headed straight for the ground. I could hear people talking calmly over a speaker of sorts as the shuttle crashed into the ground not too far from where we were standing. Then we all had to evacuate the area, which turned out to be the town where my grandma lives, and she appeared there with us as we left.

The evacuation route took us to a water slide, so we proceeded to ride down the slide in innertubes. Somehow, for some reason, I ended up in a long, wrinkly black skirt sitting down in a shallow area of the water slide, and then... I don't really remember anything else, except playing the jungle course on Mario Kart 64 and discovering a really awesome shortcut.

[insert Batman theme song here]

Oh dreams. You silly, weird, scary figments of the mind.

So last night I dreamt that I was Batman, or at least some sort of female superhero equivalent. And I'm not sure why, though, because I've never been into any of those comic book superheros. But anyways there was something big going down in town and I was at Bat HQ (which apparently was some old, abandoned-looking cottage) when I got a call on my awesome cell phone. So I ducked into this little crawl-space to take the call, but then I figured, "pffft, wtf? I'm Batman. I don't have to answer my phone." So I handed it off to my assistant (who I'm sure was supposed to be my art teacher from college) and she proceeded to discuss business with the person. There were a few other people with me in HQ (I'm assuming more assistants), including Kevin Spacey. But when I went up to talk to him he just sat there against a wall looking all paranoid and useless. Next thing I know we end up outside on the old, creeky deck but I sneak back inside to spy on somebody. And then I can't remember anything else.

At least it wasn't a fish or outer space dream.

The voices keep following

I seriously thought I was hallucinating today. I was watching the Superbowl but I kept hearing other sounds not in the direction of the TV. It was like music at first, and then turned into chatter. This continued for much of the football game.

And then I realized we had the surround sound speakers on and the noise from the crowd at the game was coming through them. Aha.

So that got me to thinking about auditory hallucinations. Does a person who has such an episode hear things inside his/her head? Or are the sounds and/or voices external?