I don't think this is the same thing as "noisy brain", but I'm wondering if anyone else has experienced this before since it sounded similar. Sometimes, typically when I'm sick and I'm trying to sleep through the symptoms (e.g. sleep all night and all day), it seems like my brain gets bored or something and suddenly I cannot stop thinking/dreaming about something. That something is different every time it happens, but it's the same thing over and over repeating in my head. Eventually my head starts to hurt and I'm seemingly forced to be awake as it is the only way to stop this.