A man is found wandering after a period of impaired awareness, and EEG monitoring during a similar subsequent episode shows clear epileptiform discharges, with sudden onset and end each time. Before revealing the answer: is this a hysterical twilight state?

No, this points toward an organic twilight state rather than a hysterical one. The presence of clear epileptiform discharges on EEG during the episode provides the identifiable organic cause that a hysterical twilight state, by definition, lacks — a hysterical twilight state arises from unconscious psychological motives in the absence of such an organic explanation. The sudden onset and end described are also characteristic of the organic, epilepsy-related form specifically. This distinction matters clinically, since it points toward anti-epileptic treatment rather than a purely psychological approach.