If you loved Room 237, try The Nightmare
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Rodney Ascher, and they both carry the paranoid mood tag, and they sit in Documentary territory. If that's the register that drew you to Room 237, the second film will land in a comparable space — through a different lens.
paranoid
What The Nightmare is
Darkness falls on a paralyzed body, a voice whispers low, a bed creaks, trapped minds frozen in terror, unable to move or escape, eight individuals recount their eerie experiences, a found-footage horror documentary from the 2010s.

