Not sure if it's in the same vein of this new thread but when I was a kid, probably 8 or 10 I had a really bad fever, could possibly have been the sickest I've ever been as a result of the mumps. Anyhow, I vividly recall having hallucinations - not sight but sound. As I was lying in bed with hot & cold sweats, I could as plain as day hear a group of people running down the hall shouting with threats they were coming to get me, sort of like a bunch of pirates or something like that. Probably lasted for a good few seconds. At the time, was only my mum and I at home and I was severely freaked out.
I think the brain can be tricked into thinking something is real when it isn't - I'm not knocking your experience Claude, just noting how complex the mind is