If you are a late sleeper, you've gone through a long time, usually many years, trying to do exactly that. Knowing you need to go to sleep earlier is trivial.. scraping all those pieces of information and making countless adjustments to your schedule in order to actually do it is not.

Somewhat off topic, you realize it's a real disservice to pg to upvote and defend any comment he makes indiscriminately? Or even with less discretion then normal.