Jesus Franco – Les Cauchemars naissent la nuit aka Nightmares come at night (1970)
Synopsis from allmovie.com:
Director Jesus Franco remade his 1965 thriller Miss Muerte as a pure exploitation piece in this Liechtenstein-produced film starring Diana Lorys. The film concerns Anne, a dancer at a Yugoslavian nightclub who moves in with a conniving lesbian named Cincia. Cincia is scheming with Anne’s doctor to eliminate witnesses from a jewel robbery they committed, and she hypnotizes Anne to carry out the murders. Meanwhile, Anne has the sensation of going insane, as she is unsure whether the murders are nightmares or reality. In an increasingly frantic state, Anne commits suicide, forcing a showdown between Cincia and the doctor. This film features plentiful nudity involving cult favorites Soledad Miranda and Maria Rohm.
Two exotic dancers embark on a erotic friendship which takes a turn when one of them begins having recurring nightmares of her killing people in which the line between realty and fantasy begins to blur to the most extreme.
Language: French (English hardsubs)