A nurse is providing teaching to the caretakers of a client who has Alzheimer's disease with mild cognitive decline. The client is beginning to experience sleep disturbances. Which of the following instructions should the nurse include?

Choice A reason: Black tea contains caffeine, which can worsen sleep disturbances and is contraindicated before bedtime, especially in older adults with cognitive impairment. Choice B reason: Maintaining a consistent wake time helps regulate circadian rhythms and improve sleep quality in individuals with dementia. Choice C reason: While physical activity is beneficial, exercising too close to bedtime may increase alertness and interfere with sleep onset. Choice D reason: Long naps during the day, especially after lunch, can disrupt nighttime sleep and worsen sleep fragmentation in clients with Alzheimer's disease.