The Twilight Zone - Season 3 Episode 5 Dream Me a Life

Roger, a curmudgeonly man in a retirement home, has nightmares of an unknown woman trying to hold back some strange creature behind a door in a room filled with candles. He is shocked when that woman, a cataleptic, becomes his next-door neighbor. Roger soon comes to realize that he is somehow tied to the woman, and that even in the dream he can be hurt and possibly killed. The next time he is drawn into the dream he tries to help her, only to realize that she is holding something in - the spirit of her dead husband, as she can't let go of his memory. Roger releases him to pass on to the other side, and slowly begins to reconcile with the woman as she comes back to life.