As I understand it, the author proposes to throw out all the time, meters, mechanical and electronic, and to live like ancestors, stand up for the sunrise go to work immediately after lunch break at work - when tired, home - when you finishes the job, dinner - when the sun went down, to sleep - when it's dark. Apologizing for primitive, rude, but approximately so.
so man should have his own, biological clocks. may be I did't understand something?

I would start with definition.
Incidentally calendar "Modern Times" is presented in view of the informer to the home page.
By the way, get up in the morning sensible enough thought about it a lot said in the Vedic literature. and almost all southern hemisphere lives like that.
There is a  biological clocks in humans, we need to start using them, all embedded in our body. a little will and intention to synchronize with gallaktik cycles and the result will exceed expectations.