relapsing psychosis

Glad to hear that helped, Katie. As a caveat--if this wasn't already clear--things like this can be symptoms of anything. Of course, anything can sort of be a symptom of anything. To jump to the most serious ones, is there a chance that the onset of night terror experiences signifies a tumor or neurological dysfunction? Yes. Is that quite startlingly unlikely? Also yes. It goes without saying that nobody can give real medical advice over here. If your friend is himself concerned, of course he should go in to his primary care doc for a checkup. In the absence of any other symptoms, however, they'd very likely tell him the same thing we told you. I don't mean to re-freak you after de-freaking you, because there's no reason to be freaked; just making sure we do the due diligence here.