Dawn(1989)

An unamed girl is haunted by a demonic creatures, She fall to madness, in a succession of nightmarish visions, until she let one of them enter her body into wound in her stomach. (This short Super-8 horror film was only release recently, as bonus content for the DVD edition of Super-8 Madness, a documentary about Action, Horror and Science-Fiction short films in France during the 80's)