A nurse is providing teaching to an older adult client about methods to promote nighttime sleep. Which of the following instructions should the nurse include?

Rationale: A. Strenuous exercise close to bedtime can stimulate the sympathetic nervous system, increase heart rate, and raise body temperature, all of which can interfere with sleep onset. Exercise is beneficial for sleep when performed earlier in the day, not immediately before bedtime. B. Long daytime naps can reduce sleep drive and make it more difficult to fall asleep at night, especially in older adults who may already experience fragmented nighttime sleep. If naps are needed, they should be brief (about 20–30 minutes) and early in the day. C. Remaining in bed while awake can create a negative association between the bed and wakefulness, worsening insomnia. Sleep hygiene recommendations encourage the client to get out of bed if unable to sleep after about 20–30 minutes and engage in a quiet activity until sleepy. D. A small, light snack before bedtime can promote sleep by preventing hunger-related awakenings. Snacks containing carbohydrates (such as milk or crackers) may help promote relaxation and support sleep onset without causing discomfort or gastrointestinal distress.