What Rough Beast, Its Hour Come Round at Last?

Daughter has started to fear things. She'll grab my hand and hold it in front of her face if any scary parts come up on one of her dvds. Now, the 'scary' is relative of course, so I'm often shielding her from something like an ogre doll in Little Einsteins.

It makes me wonder how she processes fear at this age. She hasn't exactly had anything happen to be scared of, so it's strange how she can associate these things with fear. I know she has nightmares, but I really wonder what happens in them.