Like many, the trailer gave me a very different impression than the actual film.
It's pretty obvious that it's about mental illness, however the movie attempts to combine that with some gibberish sci-fi story about a "brain box" and reality being a simulation (all connected thru some rigged cpap machines...
The movie tries so hard to become multi-layered that it becomes just damn confusing and scattered. Combined with an ending that doesn't really make any sense...ur left wondering, was it all imagined? Was salma hayek's character real? It's about as satisfying as the ending to The Sopranos, maybe even less.