Why can depression and sleep problems affect memory and thinking in older adults?

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Depression and sleep disturbances are significant factors that can negatively impact cognition and memory in older adults, often exacerbating the natural changes associated with the aging process.1

Depression: This condition is linked to a reduced density of synapses—the vital connections between neurons in the brain. This structural change directly contributes to the impairment of memory and thinking skills.1
Sleep Problems: Both insufficient sleep and excessive sleep (sleeping more than nine hours per night) are detrimental to cognitive health. Furthermore, sleeping more than nine hours is associated with an increased risk of dementia.1

While some decline in short-term memory and processing speed can occur naturally, these lifestyle and health factors play a critical role in overall mental performance. Maintaining sleep hygiene and addressing depression are essential for supporting cognitive health in later life.1