When I was a child (5 or 6) I remember often hearing voices – sometimes muttering, sometimes shouting angrily. It was often when I was sick, or suffering from a fever. It stopped happening I guess, but I still wonder if that's normal?
Fast forward twenty years and the angry insistent mob decided to once more pay me a visit during a sleepless and feverish night, this was about a month ago. Not sure if normal, I'm definitely not, but I've never heard or seen anyone mention this phenomenon in a way I could relate to until you just did.