> But the truth is, it's perfectly possible for anyone to adjust their sleep schedule and become a morning person. It just takes some conscious effort and the will-power to suffer through a week or two of re-adjustment.

That's not 100% true. I've done it, and deal with a couple of weeks of pain to realign my schedule.

I then went to bed late ONCE, and slept late the following morning. My schedule had the re-sync'd back to it's original form, undoing three weeks of work.

I can't really explain it, but it doesn't matter how much effort I put in, just staying up very late ONCE, screwes up my schedule, and I have to go back to two weeks to pain to realign my clock again.