Many people think of snoring as little more than an annoyance, but for some people it may be a sign of a serious medical condition called obstructive sleep apnea.
In this disorder, the muscles in the throat relax repeatedly during sleep, causing the airway to narrow or close. Breathing stops for short periods before the brain briefly wakes the person so they can breathe again.
These interruptions may happen many times every hour without the person remembering them. Researchers from Monash University now report that untreated sleep apnea may be linked to poorer memory during middle age, raising new questions about its role in future dementia risk.
The study, published in Alzheimer’s & Dementia, included 2,795 adults aged 40 to 70 who were taking part in the Australian Healthy Brain Project. None of the participants had dementia. They completed detailed health questionnaires and online tests designed to measure memory and thinking abilities.
When the researchers compared participants with and without sleep apnea, they found that people with the condition generally had weaker memory performance. The difference was seen mainly among people whose sleep apnea had not been treated.
Those receiving treatment performed about as well as participants who did not have sleep apnea, suggesting that treatment may help preserve normal memory function.
The researchers also found that sleep apnea often occurred alongside other health conditions that increase the risk of dementia. Participants with sleep apnea were more likely to have obesity, high blood pressure, and high cholesterol. These conditions can damage blood vessels over many years and reduce healthy blood flow to the brain.
Even so, these additional health problems did not fully explain why people with untreated sleep apnea had poorer memory. Scientists believe that repeated drops in oxygen levels, poor sleep quality, and ongoing stress on the body may also contribute to changes in brain function.
Sleep plays an essential role in maintaining memory and brain health. During deep sleep, the brain strengthens memories, removes waste products, and restores healthy nerve function. When sleep is repeatedly interrupted, these important processes may not work as efficiently. Over many years, this could potentially increase the risk of cognitive decline.
The encouraging news is that sleep apnea is highly treatable. Doctors can diagnose it through overnight sleep testing, and many patients improve with treatments such as CPAP therapy, oral appliances, weight loss, or other medical approaches.
Because many people remain undiagnosed, recognizing symptoms such as loud snoring, choking during sleep, morning headaches, and excessive daytime tiredness is important.
The researchers believe that screening for sleep apnea in middle-aged adults may become an important part of protecting long-term brain health. Treating sleep apnea together with controlling blood pressure, cholesterol, body weight, and other lifestyle factors may provide greater protection than addressing each problem separately.
Although the study cannot prove that sleep apnea directly causes dementia, it provides strong evidence that untreated sleep apnea is associated with poorer memory long before dementia develops. Larger long-term studies will now be needed to determine whether treating sleep apnea can lower the future risk of Alzheimer’s disease and other forms of dementia.
Overall, this research reminds us that healthy sleep is just as important as healthy eating and exercise. Looking after sleep during middle age may help protect memory, improve overall health, and possibly reduce the risk of dementia in later life.
If you care about Alzheimer’s disease, please read studies about the protective power of dietary antioxidants against Alzheimer’s, and eating habits linked to higher Alzheimer’s risk.
For more health information, please see recent studies that oral cannabis extract may help reduce Alzheimer’s symptoms, and Vitamin E may help prevent Parkinson’s disease.
Source: Monash University.
