Horror, mystery, “theatrical” movie where a young women is kidnapped after being at a bar/club and she wakes up in (tied to?) a bed, locked in a dark bedroom. All the scenes of the movie take place in this bedroom from that event. She sees other people there, after a while, but I don’t think they are real… No gore, very symbolic. The year: between 2005 and 2019? Indie movie perhaps. Not well known.