So, the climax of the movie reveals that the attackers are actually Sarah's (Elisabeth Olsen) hallucinations. By now, this twist has become really overused. I've actually made a list of all the films I've seen where this trope is employed. I'm not sure which of them you've seen, so I won't list them here. Just try to remember all the films you've seen where large sections of the film or secondary characters are actually projections of the main character's troubled psyche. Even if this twist wasn't a cliche, it is contrived in such a way that all the events that take place before the reveal make no sense. Seriously, how can Sarah imagine she is being chased by home invaders and also incapacitate her relatives, who are in different parts of the house? Though the camera hovers close to Sarah, there is an argument to be made that we are witnessing the events from Sarah's unreliable point-of-view. However, unlike other, more effective psychodramas, there is very little evidence in the way this movie is shot that would indicate Sarah's perceptions are distorting reality. It isn't until the last 10-15 minutes that the filmmakers conjure up fantastical imagery, probably because they felt that they needed some of these types of shots to justify the reveal. Oh, by the way, I haven't even gone into the exploitative motive behind the attacks against Sarah's relatives, which is a topic for a different discussion.