Jacobs ladder had quite a few more scenes in it that were cut because test audiences found them too disturbing, theres a whole extra sequence between the meeting with the chemist and him returning home that you can find in the deleted scenes on youtube. Honestly I always thought that the demons and horror elements were creative, but ultimately a bit tame. The intro is really strong with the subway bit and all the anti-drug posters, and then the car scene is fantastic but after that the whole thing kind of loses steam with the kid and ex-wife dream sequence. It was too grounded to be a surrealist film but also too surreal to be a grounded film, it could have done with being trimmed of the ending and dead kid story and focused more on the other story lines.
Also Tim Robbins has the most unconvincing fake laugh in the movie I’ve ever heard.
Research into the glymphatic (The rather recently discovered brain lymphatic system) is one of the more fascinating frontiers of research going on right now, we’ll be finding for decades to come the effects it has on mental health and brain diseases.