Twin casualties

Last night I dreamt that I was in an episode of Casualty (a British TV hospital drama, for the benefit of my foreign readers). All the doctors and nurses were running around as usual looking after the sick but the weird thing was that each patient was the spitting image of their attending nurse or doctor, as were any friends or relatives accompanying them. It was strangely creepy like that scene in Being John Malkovich when the eponymous actor enters his own head and ends up in a restaurant where everyone sports his face.

I can understand why I might have dreamt about a TV show that I watch only occasionally: My chum Paul Campbell is going to be writing an episode for the show (well done Paul!); but what the whole twin thing is about, I know not.