It's a common belief in Britain that (certain types of) cheese before bed can give you weird dreams or nightmares.
In A Christmas Carol, Ebenezer Scrooge blamed cheese for causing his ghostly night-time encounters. He only ate “a crumb”, and the story may have had a happy ending, but the idea that cheese gives you nightmares still persists. Is there any truth to this?
n. An open-faced sandwich of grilled or broiled cheese on bread.
I came across this term in a Guardian interview with Lorraine Bracco:
The famous fill Bracco’s conversation. Somehow, though, it feels less like namedropping than her just being one of those people for whom life ended up like an ongoing cheese dream, random faces drifting by. Madonna turns up here, Christopher Walken there.
It seems to be a British expression and may be founded in a study of British cheeses published by the British Cheese Board in 2005 claiming to have determined that eating cheese just before going to bed can affect your dreams. It further claimed that the type of cheese you ate controlled what sort of dream you had: Stilton for bizarre effects, cheddar for dreams of celebrities, etc.