“One of the times it is most common is when I go to bed at night. I’m lying there in bed, waiting to sleep, the lights are out, and the scenes I’m going to write tomorrow are in my head — or maybe the scenes I’m going to write next week — or maybe a scene from a different chapter. I can’t control it, but something starts filling my head, the characters start coming alive and I start hearing snatches of dialogue and I drift asleep with Westeros and ‘Ice and Fire’ in my head haunting me.”