"Never eat cheese before bed" is one of the oldest pieces of household advice there is, and like most such advice it is half wrong and half surprisingly accurate. What we eat and what we take does change our dreams — not through the ingredients themselves, but through what they do to sleep.

The truth about late meals

A heavy meal late at night raises metabolism and body temperature and causes more frequent waking — and more waking means more dreams remembered, especially the unpleasant ones. That is the whole mechanism behind the cheese legend: it is not the cheese, it is the timing and the quantity. Spicy food works the same way. The practical rule is unglamorous but effective: finish eating two to three hours before bed, and the vivid, restless dreams usually fade with it.

Alcohol, coffee and nicotine

Alcohol is the biggest single influence on dreaming. It suppresses REM in the first half of the night and the brain compensates later — the famous REM rebound, which produces the strange, intense, exhausting dreams of the early morning after a heavy evening. People who stop drinking often report weeks of unusually vivid dreams for exactly this reason. Caffeine late in the day fragments sleep and multiplies remembered dreams; tobacco does something similar, and nicotine patches worn overnight are well known for producing bizarre dreams.

Medication

Many ordinary medications change dreaming: some antidepressants suppress or intensify REM, beta blockers are associated with nightmares, certain asthma and Parkinson's drugs make dreams unusually vivid, and stopping some sleep medications causes a rebound of intense dreams. None of this is a reason to change anything on your own — but it is a very good reason to mention new, disturbing dreams to your doctor or pharmacist, because a simple change in dose or timing often solves it.

And the dream dictionary?

Curiously, food is one of the richest chapters in dream tradition: bread announces prosperity, a meal shared with others speaks of harmony, spoiled food warns of disappointment. So when a late dinner produces a night of food dreams, both readings apply — the physiology explains why the dream came, and the dictionary still has something to say about what it chose to show you.