The author hypothesized that this may be an evolutionary survival mechanism that allowed bands of humans to always have people who were awake or more likely to wake quickly if threatened after dark or in the early morning.

For the natural night owls (I am one) the power of a slow morning is just the way we roll. I am so much more productive at 9pm than 9am, and have reworked my daily schedule accordingly.

Yes, it's hard with kids but basically have adopted a bifurcated sleep pattern - 6 hours, wake at 6:15 am, and help with family stuff and do about an hour of non-brain intensive work, and then two more hours of sleep before rewaking and restarting work in the late morning, raring to go. In the evening I can get so much done.

I have my own company, so this flexibility is possible.