It's bugging me! In the film people realise the reality they are in is not real. They are in fact all wearing the same brown clothing, they are not eating real food only a powdery supplement, the TV they are watching is a cardboard screen. They seem to be manipulated by brainwaves telling them they are living in our reality. At the end some of them set off to find out what is really out there. I think it starts off with a man on a suit having a meeting then he goes home to his family?