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At what stage of dementia do they sleep a lot? And why?

According to the Alzheimer's Society, it is quite common for a person with dementia, especially in the later stages, to spend a significant amount of time sleeping. Understanding at what stage of dementia do they sleep a lot can provide clarity and help caregivers manage these changes in sleep-wake cycles. This increased need for sleep often relates to the progressive brain damage caused by the disease, along with other contributing factors.