The study also said that people also have an "intellectual biological clock", which is a long-term physiological reaction. There are two reasons for its formation: both congenital factors and long-term cultivation of the acquired working environment. Therefore, everyone can adjust their biological clock according to the needs of work and keep their intelligence in the best state when needed. According to statistics, the intellectual biological clock can be roughly divided into three categories:

Daylight type, manifested in early morning and early morning, is full of energy, full of energy, and has the best memory and understanding. For example, mathematician Chen Jingrun and writer Yao are used to working at two or three o'clock in the morning, which is very efficient.

Nocturnal type means that brain cells are particularly excited and highly concentrated at night. For example, the French writer Flaubert used to write all night. Over time, his all-night light became the beacon light for boatmen on the Seine.

Intermediate type, between the first two, has a particularly good effect on morning and morning study and work, such as the poet Ai Qing, in these two periods, his thoughts were full of enthusiasm and his paintings were full of flowers.

Knowing how to use the biological clock for health care, in fact, not sleeping during the day, not sleeping at night, and falling asleep soon after going to bed are all healthy manifestations.