Requiem is a 2006 German drama film directed by Hans-Christian Schmid. It stars Sandra Huller as a woman with epilepsy, Michaela Klingler, believed by members of her church and herself to be possessed. The film steers clear of special effects or dramatic music and instead presents documentary-style filmmaking, which focuses on Michaela's struggle to lead a normal life, trapped in a limbo which could either represent demonic possession or mental illness, focusing on the latter.
The film offers a medical condition (epilepsy) as the center of the affliction as opposed to demonic possession for the real-life events of Anneliese Michel, a German woman who was believed to have been possessed by six or more demons. These events also served as the basis of Scott Derrickson's 2005 film The Exorcism of Emily Rose.
The film was cast with Jens Harzer, Burghart KlaubNer, Imogen Kogge, Irene Kugler, Johann Adam Oest, Walter Schmidinger, Eva LoBau, Sandra HuLler, Anna Blomeier, Nicholas Reinke and others
(Summary from Wikipedia)