Some stuff I got out of this:
1. The ideal sleep pattern is sleeping when tired and walking up without an alarm.
2. Biphasic is recommended. Homeostatic is how easy it is to initiate sleep, circadian is how easy it is to maintain it. Circadian cycle is usually nightly, homeostatic peaks with fatigue. It's easy to have a 20 min midday nap but hard to do a midnight one.
3. Brainwork is great as soon as you wake up, and if you need caffiene, this is the time for it. Bundle stress and exercise and keep it away from the night.
Take note this is all theory and not practical, and the author hints that society should follow these and not the other way around. It took me half a decade to find a way to fit it, and what I did was:
A. Force myself to wake real early, about 4 AM. You will feel horrible for a week, but it moves your circadian rhythm forward to wake and sleep naturally without an alarm.
B. Naps in the car at lunch. Waking early gave more time to cook, which means packed meals are done in half an hour, followed by a quick nap. I set an alarm but never need it. Exercise is easy; a quick run and a lot of strong deodorant.