Sleeping Pills

The doctor advised the patient's wife, "Your husband should have a rest. I'm going to prescribe these sleeping pills."
     "Thank you, Doctor," thanked the wife. "When should I give them to him?"
     "Oh, no!" replied the doctor. "I don't want you to give them to him. I want you to take them yourself so that you will fall asleep, stop talking, and leave your husband undisturbed."