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?

A. Give the client a cup of hot black tea before bed: Black tea contains caffeine, which can stimulate the central nervous system and worsen insomnia. Clients with Alzheimer’s disease are especially sensitive to stimulants, which can further disrupt sleep patterns. B. Wake the client at the same time each morning: Establishing a consistent wake time helps regulate the sleep–wake cycle and supports circadian rhythm stability. Maintaining predictable routines is especially beneficial for clients with Alzheimer’s disease to reduce confusion and nighttime restlessness. C. Take the client for a walk 2 hr before bedtime each night: Although physical activity promotes better sleep, exercising too close to bedtime can increase alertness and delay sleep onset. Morning or early afternoon walks are preferable for improving sleep quality in older adults. D. Allow the client to take a 90 min nap immediately after lunch: Long naps during the day can interfere with nighttime sleep and contribute to nighttime wakefulness. If naps are necessary, they should be brief (20–30 minutes) and taken earlier in the day.