Dans ton sommeil (2010)

In Their Sleep: One year after her teenage son's death, Sarah's life is in pieces. Then late one night, her car accidentally hits Arthur, a young man the same age as her boy, who suddenly emerges out of the forest and onto the road. Wounded and frightened, he is running from a mysterious assailant, hunting him down after Arthur caught him red handed in the act of burglary. Sarah sympathizes with him, taking him in, only to be tracked down by the burglar whose murderous rage towards Arthur forces her to take action. Unbeknownst to Sarah, things aren't quite the way they seem...but by the time she finally realizes, it is too late to turn back...