Thanks for all the suggestions, maybe I should give an example.

Sometimes I sit in my room and I hear someone coming home. Just like the sound my dad or my mom makes when they come in the door and walk up the stairs to my room, except they don't. Noone is there when I go look.

The specific day I was talking about I kept hearing faint music. Like someone forgot to turn off their MP3 player. All day... and it wasn't mine, even when I was alone.

When driving to school I have heard our swing move... and I heard that twice the same trip.

It is strange.. I mean I can't think of any connection with my current mood or why I hear those things. They have no special meaning to me.

Sometimes it's the same with seeing things. Like I see a spider crawling on the floor but it isn't there. I'm not even scared of spiders. Really it makes no sense.

As I said before I've experienced these things before but they are getting more frequent. I suppose it's normal to have these things sometimes..

I guess it is a little like believing someone is following you when you're alone on a dark night... gives me that same kind of feeling.. like nervous.. isolated.. alone. Like I can tell myself it isn't there but I don't really believe it.