Late-night cheese linked to bizarre dreams and restless sleep, study and experts say

A study by the University of Montreal's Dreams and Nightmares Laboratory found associations between certain late-night foods and reports of bizarre or unpleasant dreams, with dairy — including cheese — among the most commonly implicated items.

Researchers who analyzed survey data reported that among participants who believed food affected their dreaming, desserts and sweets were most often blamed for disturbing dreams, followed by dairy and meat. In one analysis, 31% of respondents cited desserts or sweets, 22% named dairy and 16% named meat; in a separate breakdown of bizarre-dream reports, 38% pointed to desserts or sweets and 27% to dairy, while meat accounted for 8%.

Tore Nielsen, director of the laboratory, said the patterns reflected several likely mechanisms. He cited lactose intolerance and other food sensitivities, eating close to bedtime and ignoring internal signals to stop eating as factors that could alter sleep physiology and dream content.

"If people test positive for lactose intolerance or other food allergies, they could carefully dose the ingestion of the culprit foods to minimize their symptoms — especially at night," Nielsen told reporters.

Clinicians and nutrition experts describe competing pathways by which cheese might worsen or, in some cases, support sleep. Some specialists warn that the high fat and protein content of many cheeses slows gastric emptying, which can increase bloating, gas and acid reflux — conditions that fragment sleep and may contribute to more vivid or negative dreams.

Daryl Gioffre, a Florida-based gut health practitioner, said dairy is among the more acid-producing foods and one of the most common allergies in children. He said its low fiber content and slow digestion can leave food in the gut during the night and encourage fermentation that contributes to discomfort and poor sleep.

Another perspective comes from registered dietitians who note biochemical links between dairy and sleep-regulating neurotransmitters. Cheese contains tryptophan, an amino acid used to synthesize serotonin and melatonin, and is a source of calcium, which helps convert tryptophan into melatonin and supports neuronal signaling related to sleep.

Erin Palinski-Wade, a dietitian based in New Jersey, said cheese can play a role in better sleep for some people but cautioned that individual responses vary. "Finding the right balance and timing is key," she said. "If you find yourself tossing and turning after a nighttime cheese snack, it may be worth skipping it."

The study's authors and clinicians emphasize that evidence is still developing and that reported associations do not establish direct causation. Sleep quality and dream content are influenced by many factors, including overall diet, meal timing, underlying gastrointestinal disorders, medication use, stress and sleep disorders.

Practical recommendations from researchers and clinicians include testing for lactose intolerance or other food sensitivities when symptoms suggest them, avoiding large or high-fat snacks close to bedtime, and observing whether certain foods consistently precede disturbed sleep or vivid dreams. For those who tolerate dairy well, some experts advise enjoying cheese earlier in the day rather than immediately before sleep.

Further research is needed to clarify biological mechanisms linking specific foods to dream content and sleep fragmentation, and to determine whether particular types of dairy products or preparation methods carry different risks. In the meantime, clinicians recommend individualized approaches that account for personal tolerance, existing reflux or digestive conditions, and overall sleep hygiene.