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Multiple Choice: Chapter 55 Sundowning syndrome and sleep Question 1. Understanding ‘circadian rhythms’ is relevant to sundowning, because: A. People with dementia need to get some natural daylight every day to ensure they sleep at night B. It is exhausting living with dementia, and circadian rhythms allow the person to rest when they need to C. Poor sleep is normal in old age, so carers should look into other reasons to explain why a person with dementia is upset in the afternoon D. The dementia process damages the body's regulation of the sleep–wake cycle, which means that people with dementia have difficulties orientating themselves as the day progresses