HELSINKI — Nightmares in middle age are linked to a significantly increased risk for subsequent dementia, new research suggested. However, one expert is skeptical that this is the case.
Investigators found that middle-aged adults who reported having weekly distressing dreams at baseline had a fourfold increased risk of developing dementia compared with their counterparts who had no nightmares.
“It is likely that distressing dreams are either a causal risk factor for dementia or one of the earliest signs of it,” said study investigator Abidemi Otaiku, MD, Imperial College London, London, England.
The findings were presented here at the Congress of the European Academy of Neurology (EAN) 2024 annual meeting.
Robust Link
As previously reported by Medscape Medical News, Otaiku and colleagues found healthy middle-aged adults from the MIDUS study who had bad dreams at least once a week were four times more likely to experience cognitive decline over the following decade than those without distressing dreams. In addition, older adults who reported nightmares had a twofold increased risk for all-cause dementia.
The current study furthers the previous research by analyzing a subset of study participants who had genetic data available that was based on blood tests, saliva samples, and family history to determine if these had any impact on the previous findings.
“We found that after controlling for genetic factors, the association between distressing dreams and both cognitive decline and dementia remained robust,” Otaiku told Medscape Medical News. “We also found that there was no significant relationship between distressing dream frequency and genetic factors in either age group.”
Given that there’s no cure for Alzheimer’s disease (AD) or other dementia types, “it’s important that we identify people at the early stage before they develop symptoms, so they can benefit from disease-modifying drugs, when available, and preventive strategies,” Otaiku added.
Future studies are needed to determine whether treating distressing dreams could help slow cognitive decline and/or prevent dementia, he said.
A More Likely Culprit?
Commenting on the research for Medscape Medical News, Sebastiaan Engelborghs, MD, PhD, professor and chair of neurology, Vrije Universiteit Brussel, Brussels, Belgium, and co-chair of the EAN Scientific Panel on Dementia and Cognitive Disorders, said the findings are not novel.
“I suspect the subjects with ‘distressing dreams’ to have rapid eye movement (REM) sleep behavior disorder. This can only be ruled out by a sleep exam, which was not performed — to my knowledge — in this study.”
“It is well-known that REM sleep behavior disorder may precede dementia by many years. One of the key symptoms of REM sleep behavior disorder are nightmares, or ‘distressing dreams’…and this is why we always ask about sleep and nightmares during consultations in the memory clinic,” Engelborghs added.
“That is also why we follow up on cognitively healthy subjects who show up with nightmares, suggestive of REM sleep behavior disorder, as we do know that they are at increased risk of developing dementia, and we disclose this to them,” he added.
Speaking to Otaiku’s suggestion that future trials could assess whether treating distressing dreams might slow the onset of, or prevent, dementia, Engelborghs said that his patients with REM sleep behavior disorder are treated with specific medications “as the symptoms can be very distressing.”
However, he noted treating sleep symptoms does not reduce dementia risk. Disordered sleep is often the first, early manifestation of neurodegeneration that is the cause of future dementia, he said.
Credit, Reference & full article:
https://www.medscape.com/viewarticle/nightmares-middle-age-forerunner-dementia-2024a1000cwo
