What Foods Can Give You Nightmares?

You wake up at 4 am, having been chased through a supermarket by someone you went to school with, and the first thought is usually the same. What on earth did I eat last night? The late snack tends to take the rap, mostly because it’s the last thing you remember doing.

The research is more interesting than the folklore. Food may play a part for some people, though rarely in the way the old tales suggest, and when you eat may count for more than what you eat.

For some people, possibly. There’s no strong evidence that food alone turns a pleasant dream into a horrible one.

When researchers asked 396 students about food and dreaming in 2015, nearly one in five said they’d noticed a link between what they ate and what they dreamt. Dairy was the food they named most often.

A larger study by the same team in 2025 asked a tighter question and found that around one in 20 people said food or eating late affected their dreams. Among the foods associated with disturbing dreams, sweets and desserts accounted for 31% of mentions, with dairy next at 22%.

That 2025 study also turned up something more useful. People with lactose intolerance had higher nightmare scores, and gut symptoms such as bloating and cramps explained most of that link. A stomach that’s still hard at work at 2 am may well find its way into the plot.

There’s no evidence that chocolate causes nightmares. It may still disturb your sleep, which is a slightly different thing.

Chocolate comes up more often than most foods when people wonder what gave them a bad dream, and there are three reasons why:

• It’s a sweet: Sweets and desserts are the category people name most often for disturbing dreams, so chocolate inherits the reputation of the whole shelf.
• It contains caffeine: There are around 19 mg in a 50 g bar of dark chocolate, which is a fraction of a cup of coffee, along with about 250 mg of theobromine, a gentler relative of caffeine. The darker the chocolate, the more of both. Our guide to caffeine and sleep explains how long it hangs around.
• It’s a known reflux trigger: NHS guidance on reflux lists chocolate alongside spicy and fatty foods as a common trigger, and heartburn can make short work of a good night’s sleep.

Milk chocolate adds a fourth possibility because it contains dairy, and the 2025 research linked lactose intolerance with more nightmares. If dairy doesn’t always agree with you, raiding the Halloween tin at 11 pm may not end well. For most people, a square or two earlier in the evening is unlikely to cause any bother at all.

Only a few foods have anything measurable behind them. Here’s what has been studied, with the strongest evidence first:

Everything with evidence behind it points to physical discomfort rather than to dreams, and the food named most often is the one with the least evidence behind it. Our post on whether cheese before bed gives you nightmares digs into the dairy question properly, including the famous cheeseboard study.

The hour you eat at may matter more than the meal itself.

The 2025 research found that eating in the evening and during the night was associated with poorer sleep, more negative dreams and higher nightmare scores. No single food was singled out. The late hour was enough.

NHS reflux guidance points the same way, suggesting at least two hours between your last meal and bed, and staying upright for an hour after eating. In our 2026 UK Sleep Survey, around one in 10 people who sleep badly put it down to eating too late.

If bad dreams are a regular visitor, shifting dinner or that snack an hour earlier may be worth trying before anything gets struck off the shopping list.

Hunger at 10 pm is its own kind of sleep thief, so here’s what tends to sit more comfortably on your stomach:

• Something small: A banana, a few oatcakes or a small bowl of porridge asks far less of your digestion than a full plate does.
• Rice over noodles: A small bowl of rice beats a bowl of ramen at this hour. In that study of Japanese adults, people who ate more rice had lower odds of poor sleep.
• Gentle on the stomach: Plain yoghurt, wholegrain toast or a handful of almonds tend to go down easily. Our list of late-night snacks that won’t give you indigestion has plenty more.
• Foods linked with better sleep: Milk, turkey and oats all come up in this conversation, and our guide to foods that help you sleep explains how strong the evidence is for each.

In our survey, around one in eight people who sleep badly cited bad dreams or night terrors as a reason, while racing thoughts and stress ranked much higher on the list.

The 2025 study found the same pattern, with anxiety and low mood among the strongest predictors of nightmares. Our guides to avoiding nightmares and what causes night terrors go further into the causes.

Nightmares that keep coming back, or that leave you dreading bedtime, are worth mentioning to your GP.