Final answer:
The nurse should ask if the client snores loudly or experiences headaches to determine the potential presence of sleep apnea.
Step-by-step explanation:
The nurse should ask the specific question, Do you snore loudly or experience headaches?, to determine the potential presence of sleep apnea. Loud snoring is a common symptom of sleep apnea, as the soft tissues in the throat collapse and block the airway, causing pauses in breathing during sleep. Headaches can also be a symptom of sleep apnea due to disrupted sleep and insufficient oxygen levels.