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Cognitive decline is associated with poor sleep quality from "summary" of Why We Sleep by Matthew Walker
Cognitive decline is the gradual deterioration of cognitive function that comes with age. It affects memory, decision-making, reasoning, and problem-solving abilities. One of the key factors that contribute to cognitive decline is poor sleep quality. When we do not get enough sleep or when the quality of our sleep is compromised, our cognitive abilities suffer as a result. During sleep, our brain goes through various stages that are crucial for memory consolidation and cognitive function. When we do not get sufficient sleep or when our sleep is disrupted, these processes are interrupted, leading to cognitive decline. Studies have shown that individuals who get poor quality sleep are more likely to experience cognitive decline compared to those who get adequate, high-quality sleep. One of the reasons poor sleep quality is linked to cognitive decline is the impact of sleep on the brain's ability to clear out waste products. During sleep, the brain's glymphatic system becomes more active, clearing out toxins and waste products that accumulate during the day. When we do not get enough sleep, this clearance process is impaired, leading to the buildup of harmful substances in the brain that can contribute to cognitive decline. In addition, poor sleep quality can also affect the structure and function of the brain. Chronic sleep deprivation or poor sleep quality has been linked to changes in brain structure, including shrinkage of the brain's gray matter and alterations in white matter integrity. These changes can have a significant impact on cognitive function, leading to memory problems, difficulty concentrating, and impaired decision-making abilities.- The relationship between cognitive decline and poor sleep quality is a complex and multifaceted one. Sleep plays a crucial role in maintaining cognitive function, and when it is compromised, our cognitive abilities suffer as a result. By prioritizing healthy sleep habits and ensuring that we get adequate, high-quality sleep, we can help protect our cognitive function and reduce the risk of cognitive decline.
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