A "Sleeper" movie or film is one that perhaps should have garnered more attention than it did at the box offices, but was enjoyed by a surprisingly large number of people. Sometimes they are genre-based but oftentimes the critics just missed their mark.

To me, this is one of these great "Sleeper" movies and it's called: Dark City - circa. 1998
Watch it here if you like as it's 1 hr, 45 minutes...
https://www.imdb.com/video/vi2614494745?playlistId=tt0118929&ref_=tt_ov_vi

I've got a copy of this movie on your recomendation.
Will post again on what I think of it when I actually get round to watching it.

I have taken the time to watch this movie, it has a great line up and some very good twists and turns. Having now seen it, it's not a film I would buy, but that is just me.

If you are an avid Sci-Fi fan you will enjoy this film. 

Thanks for that Diesel. Yes, I should have explained.

My movie interests / genere lie within the realm of Sy-Fy (cable) of Sci-Fi (old school), techno-thrillers, AI, Robotics, On the edge much like the TV series here:Fringe which was kind of like out there...causing ones mind to have to leap a bit in order to grasp or follow a situation. I liked the Caprica and Eureka series and I prefer those kinds of movies, film and books to practically any kind of sports media! Even though my city's Baltimore Raven's are now the Superbowl Champions for 2013!! OK...I DID watch THAT event, much to my joy, I might add!!
I am also a long time chatbot fanatic having tried and experimented with likely hundreds during the past 3 decades!!

Just so you know....