> Whenever sleep comes up in conversation, and I mention my struggles, I feel like invariably I'm met with a response along the lines of "you _just_ have to...", and "have you ever tried ...?" followed by some arbitrary rule or herbal remedy.

So I hate to be that guy, but did you look into an ADHD diagnoses?

ADHD medications help people with ADHD gain control over racing thoughts, and that allows them to sleep.