~SPOILERS~ Yeah I don't think he knows what it is either. Like the tall man in a trench coat for a while I thought it was his annoying racist co-worker who was living in the woods for a while. I'm just terrible with names the guy that was picking on Rosa. The trench coat guy never did anything was just standing around the gas station. Aside from the time Jack had a fit and made him run away on all 4s. I don't think he ever showed up after Jack yelled at him.

In my opinion I think he has narcolepsy but he also slips easily onto the astral plane so the area looks the same when he's asleep but he doesn't know he's asleep. Sometimes he finds himself digging a hole thats because he sleep walks but doesn't always keeps his conscious. Like the REM sleep cycle gets disrupted and makes it easier to see passed the veil.

It was radio waves and their metal foundation resonated with the waves. Jerry was able to make a proper radio receiver after he heard the metal foundations making noise, kinda like how when you use radio on a phone you need headphones because the wire for your earbuds works like an antenna. In my opinion Russian Radio was a minor demon sending messages. Most demons allowed on this plane can only trick you into hurting yourself. Cohesion via charisma.