Dreams when ill

Is it just me, or does anyone else have very lucid scary dreams when they are ill?
Last night I dreamt that I was in this room and I was showing people how to do something, and no one was taking any notice. I asked the " person" next to me why I was being ignored. The answer was, "You are not there" "Where am I, then?" I asked.  "Out there, you have been for years." The "person" just gestured to the air, which I took to mean that I was dead, and didn't know it.
Scary.