I suffer from a form of depression, which comes along with a symptom I call "brain-ache": it essentially consists of a sharp pain that feels as though it's internal to my brain (unlike headaches, which I also commonly get, which are focused in my skull).

Brain-ache is worsened by deliberate conscious thinking, and trying to focus on things, and it is generally accompanied by a "mental fog" which makes it hard for me to see my own thoughts, and therefore hard to think about anything complex.

I have a few other pecularities [photic sneeze reflex, I used to cough instead of crying (that was a conditioned reflex due to abuse) and occasional verbal tics] but most are relatively minor.

Oh, yes, I can have full conversations in my sleep, that I don't remember in the morning. This includes answering the phone. This is a recent symptom, probably due to my current medication.