Time Travelling Vampire

Harriet wakes up and finds herself in what looks like her room... Until she opens the door to the hallway and realizes she's not in the place she thought. She knows it's not the bedroom, but where is she? What happened?
She looks at the clock on the wall... Wait... A clock? She looks at the water dispenser and to the glass table... All things she's never seen before! This must be a dream. She starts looking around for her brother and sister and tries to figure out how she got here, when she suddenly sees a strange man sitting on the sofa.
Tentatively she approaches him.
"Tell me, how am I here?" she asks.