UK Faces Dementia Risk as Sleep Disorder Affects Millions

Around 10 million people in the United Kingdom are believed to be affected by a sleep disorder that could significantly raise the risk of dementia. Medical professionals are warning that certain symptoms experienced upon waking may indicate an elevated risk for cognitive decline linked to obstructive sleep apnoea (OSA), a condition where breathing repeatedly stops during sleep.

Research published in the Nature Communications journal in 2022 established a connection between OSA and increased dementia risk. Scientists from the University of Queensland found a direct causal link between decreased brain oxygen levels during sleep and neurodegenerative conditions. According to lead researcher Professor Elizabeth Coulson, the study demonstrated how sleep deprivation alone caused only mild cognitive impairment in experimental mice. However, when the researchers induced sleep-disrupted breathing, the mice exhibited exacerbated features typical of Alzheimer’s disease.

Professor Coulson elaborated on the findings, stating, “Hypoxia, when the brain is deprived of oxygen, caused the same selective degeneration of neurons that characteristically die in dementia.” Despite these insights, the research did not conclusively determine how varying levels of oxygen deprivation could influence the progression of the disease. Human trials are set to commence to further explore the relationship between oxygen deprivation and cognitive decline.

The Sleep Apnoea Trust indicates that up to 10 million individuals in the UK suffer from OSA, with as many as 4 million experiencing moderate to severe symptoms. Many cases remain undiagnosed, as the most noticeable warning signs manifest during sleep. Typical symptoms include regular snoring, struggling to breathe, and silent pauses in breathing that can last from seconds to minutes.

Upon waking, individuals may notice additional symptoms that could indicate sleep apnoea. According to WebMD, these symptoms can include waking up with a sore or dry throat, experiencing morning headaches, and feeling dizzy upon waking. The NHS classifies sleep apnoea as a disorder where breathing repeatedly stops and restarts throughout sleep. While isolated episodes may not cause significant harm, neglecting the condition can lead to more severe health issues.

Professor Coulson cautioned that not everyone with OSA will develop dementia, noting that some patients have reported memory improvements after receiving treatment for their sleep issues. The current most effective treatment for obstructive sleep apnoea is a continuous positive airway pressure (CPAP) machine, which ensures the airway remains open during sleep, facilitating oxygen flow to the brain.

Researchers are hopeful that CPAP treatment could potentially mitigate dementia risk in patients with sleep apnoea. “We couldn’t fit CPAP to mice, but we experimentally prevented the hypoxia, and this stopped the cognitive impairment and neuron death, and also reduced the Alzheimer’s pathology,” Professor Coulson explained, emphasizing the promising implications of their findings.

In addition to its link to dementia, sleep apnoea is associated with various health complications, including high blood pressure, heart disease, and stroke. These issues arise because sleep apnoea causes a drop in blood oxygen levels when breathing stops, leading to increased pressure within blood vessels.

The NHS advises individuals experiencing symptoms of sleep apnoea to consult their general practitioner. Key indicators include episodes where breathing stops and starts during sleep, making gasping or choking noises, and persistent daytime fatigue.

As awareness of the connections between sleep disorders and cognitive health increases, early diagnosis and treatment of sleep apnoea may become crucial in reducing dementia risk and improving overall health outcomes for millions.