I don't read him as arguing you shouldn't do anything about it. He does end with "it is on you to decide to do something about it". What is another question, with the parameters depending on a lot of things, from personal preference (do you mind not seeing the sun?) to schedule constraints (job, children, etc.).

I just read him as arguing that you should recognize it as a natural condition rather than a failure of willpower or laziness, and approach it accordingly. That could still mean looking for methods to modify it, e.g. http://en.wikipedia.org/wiki/Delayed_sleep_phase_disorder#Ma...