Sweet dreams are made of cheese?

CheeseHad a night of bad dreams last night – vivid to the point of annoyance, because you wake up and you feel like you’ve been doing stuff all night. We’d had a sibling supper in which pizza was eaten, so I wondered whether there was any truth in the story that cheese is the cause of such things. A quick google revealed no clear answer: the British Cheese Board, perhaps unsurprisingly, say there’s no truth in the story. Yahoo! Answers is clearly undecided, and disappointingly the non-neutral dreams article on Wikipedia has no reference to cheese whatsoever.

What’s the truth of the matter, I wonder?