Biological clock is also called biological clock. It is an invisible "clock" in the organism, which is actually the inherent rhythm of life activities in the organism and is determined by the time structure order in the organism.
All animals on the earth have a physiological mechanism called "biological clock", that is, a 24-hour cycle rhythm from day to night, such as a light and dark cycle, which coincides with the earth's rotation once. The biological clock is controlled by the suprachiasmatic nucleus (SCN) of the hypothalamus. Like all mammals, SCN is located in the upper part of the oral cavity. Because of the biological clock, we have circadian rhythms of sleep, wakefulness and eating behavior.
The physiological fluctuations of the human body in one day are as follows:
1 p: In the middle of the night, most people have slept for 3-5 hours, from sleep period-light sleep period-middle sleep period-deep sleep period, and then enter dream sleep period. At this time, I am easy to wake up/dream, and I am particularly sensitive to pain. Some diseases are easy to get worse at this time.
2 o'clock: the liver is still working. Take advantage of this quiet time of the human body to step up the production of various substances needed by the human body and remove some harmful substances from the body. At this time, the working rhythm of most organs of the human body slows down or stops working, and they are in a state of rest.
3 o'clock: rest the whole body and relax the muscles completely. At this time, the blood pressure is low, and the pulse and breathing times are few.
4 o'clock: the blood pressure is low, the blood supply to the brain is the least, the muscles are in the weakest circulation state, and the breathing is still very weak. At this time, people are prone to death. At this time, the rhythm of the whole body organs is still slowing down, but the hearing is very keen and it is easy to be awakened by tiny movements.
5 o'clock: the kidney secretes less, and the human body has experienced 3-4 "sleep cycles" (dreamless sleep and dreamless sleep constitute sleep cycles). At this time, when you wake up, you will soon enter a state of high spirits.
6 o'clock: blood pressure rises, the heart beats faster, the body temperature rises, and the secretion of adrenocortical hormone begins to increase. At this time, my body has awakened and I can't sleep well. This is the first best memory period.
7 o'clock: Adrenal cortical hormone secretion enters a climax, body temperature rises, blood flow accelerates, and immune function is strengthened.
At 8 o'clock: the body enters an excited state after rest, and the liver has discharged all the toxins in the body. The brain has a strong memory, which is the second best memory period.
9 o'clock: the nerve excitability is improved, the memory is still in the best state, the disease infection rate is reduced, and it is the least sensitive to pain. At this time, the heart is working at full capacity and full of energy.
10 point: enthusiasm is high, enthusiasm will last until lunch, the human body is at its best for the first time, and the pain is easy to disappear. This is the most creative moment for introverts. They can do any job. It's a pity that it is wasted at this time.
1 1 point: The heart continues to work rhythmically, which is consistent with the positive state of mind. The human body is not easy to feel tired, and hardly feels great work pressure.
12 point: all the energy of the human body is mobilized. General mobilization, need to eat. Still sensitive to alcohol at this time. After lunch, the work in the second half of the day will be greatly affected.
13 o'clock: I feel sleepy after lunch, and the excitement period of the first stage of the day has passed. At this time, I feel a little tired. I want to have a proper rest, and it is best to take a nap for half an hour to 1 hour.
14 point: the energy fades, which is the second low tide stage in the 24-hour cycle, and the response is slow at this time.
15 o'clock: the body has improved again. At this time, the sensory organs are particularly sensitive and the human body is back on track. The gradual recovery of work ability is the most vigorous moment for extroverts to analyze and create, which can last for several hours.
16 point: the sugar in the blood increases, but it will soon drop again. Doctors call this process "postprandial diabetes".
17 o'clock: the working effect is higher, the sense of smell and taste are in the most sensitive period, and the hearing is in the second climax of the day. It is better to start exercising at this time than in the morning.
18 point: Physical strength and endurance of physical activity reach the peak in one day, and the desire to exercise more rises. At this time, the pain has dropped again, and athletes should work harder at this time to achieve good sports and training results.
19 point: when blood pressure rises, psychological stability drops to the lowest point, and the spirit is the most unstable and easily excited. Small things can also cause quarrels.
20 o'clock: All the food and water of the day have been reserved, and the weight is the heaviest. The response is extremely quick and agile, the driver is in the best state, and it is not easy to have an accident.
2 1 point: memory is particularly good, and it is the best time of the day (the fourth and most efficient time) before going to bed.
22 o'clock: body temperature begins to drop, drowsiness drops, immune function is enhanced, and white blood cells in the blood increase. Breathing slows down, pulse and heartbeat decrease, and hormone secretion level decreases. Most functions in the body tend to be low.
At 23 o'clock, the human body is ready to rest and the cell repair work begins.
24 o'clock: The body begins the heaviest work, replacing dead cells and establishing new cells to prepare for the next day.