Dark, underrated sci-fi

Rating: 10/10 (29 October 2017)

How do we know the "reality" we experience is real? How do we know we do not live in a computer program, or that we are not experiencing a dream? The reality of the humans in this movie is created by an alien race ("the Strangers"). Every night, reality changes: the whole city stops and physically transforms, memories are implanted, "reality" changes Humans are experiments. There is a collaborator. A few of the humans cannot have their memory totally removed. One becomes a confused fugitive, and eventually the system of control collapses....
It really is dark. Incredibly well shot. I don't understand why this was never a hit. It is my favorite sci-fi. I must "sleep now".