In June 2025, researchers at the European Academy of Neurology Congress presented a finding that sounds engineered for headlines: adults who reported nightmares every week were about three times as likely to die before age 75, and frequent nightmares predicted premature death more strongly than smoking, obesity, poor diet, or physical inactivity. The claim rests on data from more than 183,000 people followed for up to 19 years. It deserves a careful read, not a panic.
What the study actually did
The lead researcher, Dr Abidemi Otaiku of the UK Dementia Research Institute at Imperial College London, pooled six long-running population studies covering 2,429 children aged 8 to 10 and 183,012 adults aged 26 to 86. Adults reported at the start how often they had nightmares, then the studies simply watched what happened, in some cohorts for nearly two decades. Premature death was defined as dying before 75. The full breakdown is in the EAN 2025 congress summary.
The clever part is what else got measured. In children, the team looked at telomere length: the protective caps on the ends of chromosomes that wear down with age and stress. In adults, they used telomeres plus epigenetic clocks (measures with names like DunedinPACE, GrimAge, and PhenoAge), which read chemical marks on DNA that shift predictably over a lifetime. These tools estimate whether your body is older than your birth certificate says. That gave the researchers something no nightmare study had before: a molecular trail.
The numbers, plainly
Adults who reported weekly nightmares had an adjusted hazard ratio of 2.73 for premature death compared with people who reported none. In plain terms, roughly triple the risk after accounting for standard risk factors. Even monthly nightmares came with faster aging and higher mortality than no nightmares at all. That kind of dose-response gradient, where more exposure tracks with more harm, is one of the patterns epidemiologists look for when deciding whether a correlation might be more than coincidence.
Then comes the line that launched a hundred headlines: weekly nightmares predicted premature death more strongly than smoking, obesity, poor diet, or low physical activity. Sit with how strange that is. A thing that happens entirely inside your head, while you're unconscious, outperforming cigarettes as a mortality signal. A predictor isn't a cause, and a signal can be strong precisely because it integrates a lot of underlying trouble. But it's a remarkable result either way.
The mediation analysis is where it gets interesting. Both children and adults with frequent nightmares showed faster biological aging, and that accelerated aging accounted for roughly 40% of the link between nightmares and early death. The wear isn't hypothetical. It shows up in the molecules.
Why would a dream age your cells?
Our sleeping brains cannot distinguish dreams from reality. That's why nightmares often wake us up sweating, gasping for breath, and with our hearts pounding.
Dr Abidemi Otaiku, EAN Congress 2025
That's the proposed mechanism in miniature. A nightmare isn't a scary story you watch; as far as your body is concerned, it's a threat you survive. The fight-or-flight system fires for real: adrenaline, racing heart, and a surge of cortisol. Otaiku's argument, reported in coverage of the presentation, is that frequent nightmares mean repeated, prolonged cortisol elevations, and cortisol exposure is closely tied to cellular aging.
There's a second pathway, and it's less dramatic but probably matters just as much. Nightmares fragment sleep. They wake you, they keep you from settling back down, and they eat into the deep, restorative stages where the body does its overnight repair work. Run both processes a few nights a week for decades and compounding does the rest.
Where the headlines outran the evidence
Now the cold water. This was a conference presentation, building on an abstract presented to the American Academy of Neurology earlier in 2025, and at the time it was presented it hadn't yet been through full peer review as a published paper. Conference findings usually hold up, but numbers sometimes shift on the way to print.
It's also observational. Nightmare frequency was self-reported, mostly at a single point in time, and people differ enormously in how well they remember their dreams at all, which means some frequent nightmare sufferers surely got counted as having none. And nightmares can be an early symptom of illness rather than a cause of anything, a possibility no statistical adjustment fully eliminates.
What keeps this study from being just another scary correlation is the children. Kids aged 8 to 10 with frequent nightmares already showed shorter telomeres. Whatever is going on, it starts early, and it's hard to explain away with the diseases of middle age.
The part you can actually control
Here's the strange consolation buried in a grim dataset: of all the mortality predictors on that list, nightmares are the easiest to treat. You can't undo twenty years of smoking in a month. Frequent nightmares often respond to treatment in weeks.
Otaiku's own suggestions, per the congress coverage, are unglamorous: keep good sleep habits, manage stress and anxiety, skip the scary content before bed, and for persistent cases, use proven treatments like cognitive behavioral therapy for insomnia or imagery rehearsal therapy.
Imagery rehearsal therapy in one paragraph
While fully awake, write down a recurring nightmare. Then rewrite it, changing whatever you want: the ending, the setting, the thing chasing you. Rehearse the new version in your imagination for ten to fifteen minutes a day. Over a few weeks, the rewritten script starts overwriting the original, and for many people the nightmare fades or transforms. It's one of the best-supported treatments in sleep medicine.
We've written before about lucid dreaming as a nightmare treatment, and this study raises the stakes on that whole line of research. If frequent nightmares genuinely accelerate aging, then treating them stops looking like a comfort measure and starts looking like preventive medicine.
An occasional nightmare is just your brain running its overnight maintenance with the volume turned up. Every week is different. On this data, a weekly nightmare looks less like noise and more like a smoke alarm, and unlike your genes or your birth year, this one comes with an off switch.