Dream Sorcerer

Prue finds her sleep disturbed by strange dreams in which she's stalked and taunted by a wheelchair-bound man who is actually a sleep researcher (Matt Schulze). He is killing women who he feels scorned him by visiting them in their dreams where he has absolute power. His victims' bodies have injuries consistent with falling off a tall building, yet are found in locked apartments and haven't been moved. Prue figures out the relationship to sleep and calls for the other two to check the Book of Shadows, which fails them for the first time. While she is fatigued and driving home from work in her car he attacks again and successfully causes her to drive into a telephone pole despite the sister's cell phone attempt to keep her awake. In Prue's dream, just as the Sorcerer is wheeling her gurney to the edge of the hospital building roof to throw her off the top, Piper and Phoebe make contact with her which enables her to gain use of her power, and she manages to reverse the situation so he falls to his death.