Lights Out (2016)
Directed by: David F. Sandberg
It is based on Sandberg's 2013 short film of the same name.
When Rebecca (Teresa Palmer) left home, she thought she left her childhood fears behind. Growing up, she was never really sure of what was and wasn't real when the lights went out...and now her little half brother, Martin (Gabriel Bateman), is experiencing the same unexplained and terrifying events that had once tested her sanity and threatened her safety. A frightening entity ([]) with a mysterious attachment to their mother, Sophie (Maria Bello), has reemerged. But this time, as Rebecca gets closer to unlocking the truth, there is no denying that all their lives are in danger...once the lights go out.