Sleep, My Love (1948) is a feature film directed by Douglas Sirk, and starring Claudette Colbert, Robert Cummings and Don Ameche.
Alison Courtland, a wealthy New Yorker, hasn't a clue how she ended up on a train bound for Boston. When she phones her husband, Richard, the police listen in and learn from Richard that his wife has threatened him with a gun.
On a flight home, fellow passenger Bruce Elcott falls in love with the married but unhappy Alison. Her husband makes Alison begin seeing Dr. Rhinehart, a psychiatrist. But it turns out that Rhinehart is a fake. He is actually Charles Vernay, a photographer hired by Richard Courtland, who is having an affair with another woman and hopes to get rid of Alison for good.
The scheme is to drive Alison to suicide and inherit her money. Elcott arrives just in time to find Alison, apparently under hypnosis, about to leap from a balcony to her death.
Elcott discovers that Vernay is the man who pretended to be the doctor. Richard, meanwhile,...