“Comfortably Numb” is the moment the body quits and the schedule keeps going. It’s written for delirium, for detachment from reality, for that strange state where something inside you pulls back and you only arrive in waves. A lot of people filed it under “drugs” because of the injection and the little pinprick, but Roger Waters has clarified this again and again, for him the root is illness and psychological withdrawal, not recreational substance use…The rest is the story of this iconic song