Occasionally Arthur went under by himself. He did it to be more productive with his time, he did it to keep his house in order, he did it to train in the field. It was work. There was never a time when Arthur dreamed to step away from reality. He never dreamed of the things that he couldn't have in his waking life. No places in his mind were built from memories.
Still, Arthur wasn't perfect. Things had a way of slipping through the cracks.