Like you, I spent some time homeless in my late teens. I mostly chose that path to get out of a bad situation, but definitely had it better than some. At least I had my car to sleep in and occasionally friends couches.

I didn't know about the brains and PTSD, but like you said, it makes sense. I also hadn't heard 'rent insecure' before either, but I know far too many people who are in that situation. This is really eye opening.