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What does it mean when a dementia patient stays up all night?

According to the Alzheimer's Association, up to 20% of people with Alzheimer's disease and related dementias experience sleep disturbances, a distressing symptom often referred to as 'sundowning.' The question, "What does it mean when a dementia patient stays up all night?" points to a complex mix of neurological, environmental, and physiological factors that profoundly impact both the person with dementia and their caregivers.