Only when getting jet lag or having difficulty falling asleep, we will pay attention to our biological clocks.  In fact, as anything in the world will happen or operate in a regular pattern, the brain's biological clock will also operate in rhythm with the alternation of day and night.  All functions of human bodies will also operate repeatedly according to biological clocks, affecting our birth, ageing, sickness and death.

In an article in the latest issue of《Newsweekly》in the USA, it is pointed out that there are many rhythms and patterns concerning human bodies.  Understanding those patterns and living according to them will make people healthier.   In the article, two American scientists, Roberto and Steven, summarize and recite seven common rhythms and patterns.

1. Body temperature is lowest while waking up in early morning, and is highest between 4 and 5 p.m..  If it is as high as 37.2 degrees Celsius at 7 a.m., then you may probably run a fever.  But if it is at such a level at 5 p.m., then it is a normal body temperature.

2. The probability of acute heart disease attacks in the small hours is double that in other time of the day.

3. The number of birth peaks in the morning and afternoon.

4. The number of suicide also peaks in the morning and afternoon.

5. Biological clock is the best basis on which a doctor tells the patient when to take medicine.  For example, aspirin and antihistamine should be taken in the morning in order to achieve best efficacy.  In some kinds of cancers, it will be more efficacious and side effect will be less harmful if chemotherapy is undergone at night.

6. Compared with other time of a day, it is easier for people to have sex before falling asleep at night.

7. If we live in a completely dark environment, it will take a longer and longer time for the hour hands in biological clocks to do a lap, until the clocks are set by sunlight anew.  "Clock genes" are ever controlling our body temperature, the secretion of hormones and most cellular activities.