This was a really fascinating paper! The first part feels intuitively true – that dreams are instructional surfacings of situational classes that require attention. The bit about PTSD dreams being "mercy of environment" rather than having situational autonomy was really interesting. It's a shame the paper cuts off right there, but I'm glad they at least dropped the teaser, it's a thread I'm going to pull. If you have any more recommended reading on this, I'd love to check it out / talk about this. Email's in profile.

If you want to dig more into the "anxiety/avoidance mental responses are fundamentally biological" aspect: I and others on HN recommend "The Body Keeps The Score".