I noticed that as well when I started getting up early after years of being a night owl. There simply aren't as many distractions in the morning, because most

I noticed that as well when I started getting up early after years of being a night owl. There simply aren't as many distractions in the morning, because most other people are either still sleeping or at work. I guess the same would work if most of your workday were really late at night (e.g. midnight to 8 am), but for most people, that kind of lifestyle tends not to be very compatible with the other demands of life and business. So working from early morning until early afternoon seems to hit a nice balance between lack of distractions and compatibility with other people's schedules. If you really need to be a night owl, well, haven't we got the technology to adjust the lighting in our buildings so that you feel like it's afternoon even when it's only 8 am?