nightmare

I had this one around 10 years old. I'm riding my bus on a field trip, and I fall out the back. I stumble over to this house, where there is a woman, who welcomes me inside. I ask her if I can spend the night. She replies, "Yes, you can sleep upstairs, with the dead baby. I look at the baby sitting on the floor, and she bites her older sister's head off, and spits it out. The whole family starts to have blood leaking out of their mouths, and stare at me. Then I wake up.

DF #1: I am attending Hogwarts School of Witchcraft and Wizardry, go to Potions class, get an A, and get kidnapped by someone with gray skin.
DF #2: I am in a getaway vehicle shooting a machine gun at a pursuing semi truck.
DF #3: I am in a dark, old house which I have had a really bad nightmare in, and I have the Poltergeist 2000 strapped to my back.