All the Colors of the Dark (1972)

In 'All the Colors of the Dark', a woman named Jane starts having nightmares after a car accident that killed her unborn child. Her husband tries to help her through therapy, but things take a dark turn when Jane becomes involved with a Satanic cult. As her nightmares and reality become increasingly intertwined, Jane must confront her fears and find a way to escape the clutches of the cult.