After washing your hair at night, it is of course best if you have enough time to let your hair dry thoroughly before going to bed. But sometimes after 10 at night, I'm too busy to wash my hair. After washing my hair, I was so tired that I couldn't open my eyelids and fell asleep before my hair dried. Washing your hair every day is prone to baldness, and the older generation will say that you will have a headache in the future. In fact, after modern scientific research, people find that this is not unreasonable.
Related to thermoregulation
1, shampoo at night?
In the process of metabolism, the human body constantly generates heat to maintain body temperature, and at the same time, heat is transferred to the body surface through blood circulation, and is continuously released to the outside world through radiation, conduction, convection and evaporation.
People with strong physical resistance have normal thermoregulation function. Through adjustment, the two processes of heat production and heat dissipation are balanced, that is, when the body temperature tends to decrease, heat production increases and heat dissipation decreases, so that the body temperature is still maintained at about 37℃. For people with weak body resistance, their ability to automatically regulate body temperature and maintain normal body temperature is poor, so when the whole body or a certain part is cold, it is easy to catch a cold.
After we wash our hair with hot water, because of the warm effect, the scalp capillaries expand and the body radiates more heat to the surrounding area. At the same time, because the washed hair is wet, it evaporates a lot of water and takes away a lot of heat. Generally, one gram of water evaporates and takes away 500 calories.
Due to the increase of heat dissipation, the body is frozen, which reflexively constricts the capillaries of the upper respiratory tract, reduces the local blood flow and the resistance of the upper respiratory tract, so that the locally existing viruses or bacteria take advantage of it to grow and multiply, causing upper respiratory tract infection, thus causing cold symptoms such as runny nose, stuffy nose, headache and even fever. It is best not to wash your hair before going to bed, but if you fall asleep before your hair is dry, the regulation function of the thermoregulation center is low at this time, and you are more likely to catch a cold.
Therefore, generally speaking, it is best not to wash your hair before going to bed. If you want to wash it, dry it with a dry towel, and then blow dry your hair before going to bed, so you won't catch a cold. I fall asleep when my hair is still wet, and I'm prone to catch a cold.
Shampooing at night is taboo.
First, the taboo time of shampooing
1, women should not wash their hair during menstruation.
Due to the special physiological changes during menstruation, the body is relatively in a state of qi and blood deficiency, and its resistance is reduced. Chinese medicine believes that the head is the meeting of all yang. During menstruation, the blood supply to the brain is relatively insufficient, and the head is also prone to cold. The stimulation of hot and cold shampoo may also cause headache, dizziness and other manifestations of cerebral blood supply deficiency and vasospasm, which is called "head wind". Therefore, try to avoid washing your hair during menstruation.
You can't wash your hair immediately after eating.
Just after a meal, washing your hair immediately will hurt your stomach. Washing your hair immediately after a meal may cause heart ischemia and trigger a sudden attack of cardiovascular and cerebrovascular diseases. It is best to take a bath one or two hours after meals. You can choose the bath time according to your own constitution. For example, people with weak constitution can choose to take a bath at noon when the sun is at its peak.
It is not advisable to wash your hair before going to bed.
Many people are used to taking a bath and washing their hair at night. Some people think that using a hair dryer will hurt their hair, but they always blow it carelessly. Washing your hair before going to bed, especially when you can't wait to dry it, is most likely to cause colds and headaches. If you don't blow dry your hair at night, it will leave moisture on your scalp and coagulate at night. Doing so for a long time will lead to qi stagnation and blood stasis, and the meridians will be blocked. If it is cold and wet in winter, it is more likely to cause diseases.
Second, the precautions for shampooing
1, don't scratch your scalp with your nails when washing your hair.
There are many bacteria in nails, and once the delicate scalp is scratched, it is easy to induce infection. When applying shampoo, gently push the scalp with your fingertips to decontaminate and promote blood circulation.
2, the conditioner must be blocked in the hair roots.
Because the hair follicle is open when washing hair, the conditioner is coated on the hair root, and the chemicals inside can easily penetrate and block the hair follicle. It is recommended to straighten your hair first and apply it to the hair tip near your ears. Be sure not to let the conditioner touch your scalp.
3. Don't sleep until your hair is dry
When the hair is wet, the hair scales open, and the hair is delicate and not resistant to friction. If you sleep in a semi-wet and semi-dry state, it will cause the cuticle to become thinner and make your hair dry.
4. comb it before washing.
"The skin doesn't exist, but the hair is connected." Scalp is very important for hair. Comb your hair with a wet comb before washing your hair, so that dirt and dust attached to your scalp can float on the surface, so that you can wash your scalp and hair at the same time. In order to avoid hurting the scalp, it is recommended to use a comb with wide teeth and round head.
Don't go out until your hair is dry.
Studies have found that hair receives more than twice as much ultraviolet radiation as face. Ultraviolet rays will make hair scales thin and fall off. Go out immediately after washing your hair. Ultraviolet rays can easily cause hair to break and split. If you go out, you'd better take an umbrella or wear a hat to prevent ultraviolet rays.
Many careless little things in life may seriously affect our health. Therefore, if you want to be a healthy and beautiful woman, you must learn more about daily health care. Female friends must keep in mind these three taboo times and five precautions.
What should women pay attention to when washing their hair at night? Health Network experts pointed out that if women wash their hair at night, they must blow dry their hair before going to bed, otherwise it will be harmful to their health.