The Dreamcatcher

Begins using it on this lab assistant while she sleeps. It's a funny tool. The patient does not remember any dreams that are recorded, and as long as the recorder is on, the patient cannot wake up. She stops remembering her dreams, and the more he records them, the more often he shows up in them, until he is so involved with watching these movies of her dreams that he starts dreaming about her same dreams... Continuations.

They fall in love.

He finds out that her dreams are now continuing off of his continuations, and everything gets really freaked out at that point, because she's not supposed to remember, she shouldn't be able to perform continuations.

She dreams about killing him.

He asks her to use the dreamcatcher on him. He watches the movie, without her of course, and he sees the same dream.

Then he finds out that she's been recording his dreams, the whole time, and was doing weird things that controlled the dreams... or was that a dream? Confusion, suspicion, one final scene where they fight. He dies, and the movie fades with her dragging his body into the meat freezer, where there are, like, ten other bodies.