Bad Dreams (1988) on Netflix

The lone survivor of a suicide cult wakes from a thirteen-year coma in a psychiatric ward, where other patients suddenly start dying under mysterious and gruesome circumstances.

In the mid-'70s, a cult group called Unity Field commits mass suicide, but a young girl survives. After being in a coma for thirteen years she wakes up in a psyche ward, not remembering the incident. The psychiatrist tries to help her remember, but she begins seeing the leader of the cult talking to her from the grave, and the other members of her therapy group begin to commit suicide around her. Or is it suicide?

—Ed Sutton <esutton@mindspring.com>

It is the mid-70's. A sinister cult called Unity Fields commits mass suicide in a horrific manner - by fire - at the behest of its psychopathic leader, Harris. Only one young woman named Cynthia survives to tell the tale. Now, 13 years later, Cynthia is having grim reminders of the mass-suicide, as people around her begin to die one at a time. Cynthia finds out quickly that the ghost of Harris is back... to claim his 'love child'.

—Derek O'Cain