A nurse is talking with a coworker who reports difficulty sleeping on her days off. Which of the following recommendations by the nurse is appropriate to improve her coworker's ability to sleep?

A. Engaging in vigorous physical activity too close to bedtime can increase alertness and elevate heart rate, making it harder to fall asleep. Light exercise earlier in the day is beneficial, but intense activity immediately before sleep can disrupt sleep onset. B. Daytime naps, especially late in the day, can interfere with the natural sleep-wake cycle, making it difficult to fall asleep at night. Avoiding naps helps consolidate sleep at night, improves sleep quality, and promotes a more consistent circadian rhythm. C. Exposure to light during sleep, even dim light, can disrupt melatonin production and interfere with sleep quality. The bedroom should be dark, quiet, and cool to promote restful sleep.