I've come to this thread via Nightmares and just wanted to add that there is a well-known neuropharmacological condition commonly known as the 'cheese effect'. When neurotransmitters released by neurons have crossed the synaptic gap and done their thang with the intended receptors, they must be removed and inactivated as quickly as possible. Left hanging around, neurotransmitters tend to wander off activating receptors in a very cavalier and imprecise manner. The main transmitters (dopamine, 5H-T [US serotonin], noradrenaline [US norepinephrine]) are broken down by the MAOs (Monoamine Oxidase) enzymes. From the 1950's in the US there was an increase in use of MAO inhibitors as a means of treating depression by letting the transmitters hang around for longer with increased receptor activation, an approach still used today but with different drugs. But the MAOs also metabolise an amino acid derivative called Tyramine which can cause an increase in blood pressure, so taking MAO inhibitors (MAOI) also increases the level of Tyramine. Mature cheese contains an abundance of Tyramine (probably due to microbial action) so eating mature cheese on top of MAOIs can lead to death, but usually just dreadful headaches and weird shit and is a definite no no.
I'm not saying that eating cheese gives you nightmares, I just wonder if this association may have entered the collective consciousness as a result of horror stories concerning cheese and anti-depressants in the 1950s onwards.