The Biological Clock

The biological clock determines the daily rhythm of the working of our organs. All of us have our personal clock, which operates in a proper, natural rhythm throughout the day, controlled by the phases of day and night.

The diurnal biological clock is regulated in the anterior part of the hypothalamus by the central nervous system, and in particular, by the suprachiasmatic nuclei that interact with the pineal gland and the retina. This action occurs due to chemical reactions occurring under the influence of light (melatonin Рthe sleep hormone produced by the pineal gland). 

People in tune with their biological clock say that they feel the effect of a greater secretion of melatonin with sunset – the body begins to calm down and prepare for night or sleep mode. Our biological clock governs every process taking place in the body, and in general, affects mental and physical health.


Biological clock and physiology

It is safe to say that the biological clock is our physiology because it includes the rhythm associated with sleep (read: Sleep can help you lose weight), and rest time, metabolism, hormone secretion, brain function, variable body temperature, variable blood pressure, behavior, appetite, and working and regeneration of organs. Together, these processes define the right moment for particular phases of everyday life, such as the time for waking up in the morning, breakfast and other meals, physical activity, etc.


Compare your daily activities to the true biological clock of your body.

5 am – 7 am (LARGE INTESTINE)

This is the best time to wake up. Hormones begin the process of awakening the body. The level of melatonin gradually decreases, and the level of cortisol begins to increase. This increases blood pressure and glucose.

During this time, the large intestine works at the highest level, so the morning is the best time to use the toilet and cleanse the body of toxins and food leftovers.

Men’s testosterone levels are the highest at this time, which is why morning sex is the healthiest for them.


7 am – 9 am (STOMACH)

At this time, a wholesome meal will be necessary to produce energy that will help your body function well throughout the day. During these two hours, the metabolic process accelerates significantly, and therefore, even a large breakfast will be digested. If you want to eat something sweet, this is the best time for that. This way, the sugary food will be digested  without guilt by the end of the day.


9 am – 11 pm (SPLEEN)

This is the best time for work involving your brain, creativity, and body coordination. It is the best time for meetings, creative work, and searching for new solutions.

If you do not work during this time, you can opt for physical activity.


11 am – 1 pm (HEART)

This is the energetic maximum of your heart. Do not drink coffee at this time because the blood pressure gives us enough energy. This is still a good time for creative work and all activities that require thinking.


1 pm – 3 pm (SMALL INTESTINE)

This time is associated with the absorption and selection of food and the least body energy.

It is best to eat your lunch at about 1 pm and then let the body rest for a short while by going for a quiet walk or taking a nap. A small rest will refresh you and allow you to regain your strength for the next part of the day.


3 pm – 5 pm (URINARY BLADDER)

Here, we have the highest energy level. The brain processes information well, and muscles and joints are loose and limber. So you can use this time for learning or physical activity.


5 pm – 7 pm (KIDNEYS)

This is a continuation of the previous phase. We can continue to use this time for learning or physical activity. Eat a nutritious and easy-to-digest dinner at around 7 pm, and get ready to relax.


7 pm – 9 pm (PERICARDIUM)

It is time to relax, spend time with your loved ones, read a book, or get a massage.

At this time, melatonin begins to emerge with the sunset.


9 pm – 11 pm (TRIPLE WARMER)

This is the time for evening meditation, bathing, calming down, and sleeping. Try to fall asleep before 11 pm.


11 pm – 1 am (GALLBLADDER)

Sleeping is the time when the body regenerates after a full day of various events. In these hours, bile secretion, cell regeneration, intensive regeneration, and blood cell formation occur.


1 am – 3 am (LIVER)

Further regeneration of the whole body occurs during sleeping. During these hours, the liver works at the highest level, cleansing the liver and blood.


3 am – 5 am (LUNGS)

During this time, the lungs work on maximum oxygenation of the body and getting rid of toxins. During this time, the brain also processes memory, and dreams may commonly occur.


The biological clock of most people will be very close to the biological clock described above. Chronobiology (the science of circadian rhythm) states that there are different types of biological clocks. Therefore, if you want to find your own rhythm, you should make small changes like the ones mentioned above and carefully observe your body.


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