Regulations on the temporary organization of live systems, including – the person – one of the basic principles of the biological organization are formulated. Development of these provisions very important for the analysis of pathological conditions of live systems.
The most hard work should be done in those hours when the main systems of an organism function with the maximum intensity. If the person "pigeon", peak of working capacity falls on three o'clock in the afternoon. If "lark" – that time of the greatest activity of an organism falls for the midday. "Owls" are recommended to perform the most hard work at 5-6 o'clock in the evening.