Weird scratches

In the last week, I've woken up several times with strange scratches on my chest.

I have no idea how they got there.

I figure it would be any of these things:

1. I'm having bad dreams and scratching myself.

2. The child or dog in my bed could have done it while sleeping.

3. I'm changing into a werewolf at night and unaware of it.

4. A confused vampire keeps trying to bite me.

5. I have an alien inside of me trying to break out.