Older men who regularly experience nightmares may be twice as likely to develop Parkinson's disease later in life, according to a study by the University of Birmingham. The research, published in eClinicalMedicine, suggests that disturbing dreams could be one of the earliest warning signs of the neurodegenerative condition, appearing years before more typical symptoms such as tremors or stiffness.
Analysing data from a 12-year US cohort study involving 3,818 independently living older men, researchers found that those who reported having nightmares at least once a week were significantly more likely to be diagnosed with Parkinson's. During the follow-up period, 91 cases were identified, with the risk more than doubling for frequent nightmare sufferers. In the first five years, the risk was over three times higher.
Lead investigator Dr Abidemi Otaiku highlighted the potential for early detection. "Identifying the significance of bad dreams and nightmares could indicate that individuals who experience changes to their dreams in older age – without any obvious trigger – should seek medical advice," he said. The team now plans to use EEG to explore the biological mechanisms behind dream changes and extend the research to larger, more diverse groups.
Parkinson's disease progressively affects movement, often beginning with subtle signs like a slight tremor. Current warning signs are few, and many are not unique to the condition or require costly hospital tests. The study's findings suggest that monitoring dream patterns could offer a simple, non-invasive indicator of future risk.
