What would you call what Dian does?

Dian shits in his sleep, I shit you not. Not in his bed, and not always in the bathroom. Like sleep-walking. But really it's sleep-shit-walking. Or would that be only if he shits while he's actually walking? Doesn't matter. He sleep-walks and then shits somewhere in the apartment before going back to bed. When I confronted him about it yesterday, all he said was, "Oh yeah, I was burned in a fire when I was little..." and then walked away. WTF?