some women often sleep upside down because they wash their hair late and their hair is long and difficult to dry. Although this habit has no major problems in the short term, it still does great harm in the long term. Let’s take a look with you.
Many people who love cleaning have the habit of washing their hair before going to bed. If they have enough time to let their hair dry, it’s certainly best. But sometimes it’s too late. After washing my head, I’m too tired to open my eyelids. Therefore, I fall asleep before my hair is dry. As everyone knows, this is very harmful!
in the process of metabolism, the human body always generates heat to maintain body temperature. At the same time, these heat is transmitted to the surface of the body through blood circulation, and continuously radiates to the outside through radiation, conduction, convection and evaporation.
people with strong body resistance have normal temperature regulation function. Through regulation, the two processes of heat production and heat dissipation are balanced, that is, when the body temperature tends to decline, the heat production increases and the 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 they are easy to catch a cold when the whole body or a part is cold.
after we wash our hair with hot water, due to the warm effect, the scalp capillaries expand and the heat radiated by the body to the surrounding increases. At the same time, because the hair is wet after washing, a large amount of water evaporates, so it will also take away a lot of heat. Generally, when one gram of water evaporates, it takes away about 500 calories (the vaporization heat of water is 40.8 kJ / mol, equivalent to 2260 kJ / kg). 1 kcal = 4.18 kJ, so the heat of vaporization of 1 kg of water is 540.67 kcal. The heat of vaporization of 1 gram of water is 540.67 calories. That is, 540.67 calories can be collected for each gram of water evaporated).
due to the increase of heat dissipation, the body is frozen, which reflexively shrinks the capillaries of the upper respiratory tract, reduces the local blood flow and reduces the resistance of the upper respiratory tract, so that the local pre-existing viruses or bacteria take advantage of the weak point to grow and reproduce, resulting in the infection of the upper respiratory tract, resulting in cold symptoms, such as runny nose, stuffy nose, headache and even fever.
generally speaking, it’s best not to wash your hair before going to bed. If you want to wash your hair, dry it with a dry towel, and then blow dry your hair with an air duct before going to bed, so it’s not easy to catch a cold.
Harm 1: it is easy to induce facial paralysis
facial paralysis. Its scientific name is facial nerve paralysis. It is a common and frequently occurring disease and is not limited by age. The general symptom is that the mouth and eyes are crooked, and patients often can’t even complete the most basic actions such as raising eyebrows, closing eyes, drum mouth and so on.
why does washing your head wash out facial paralysis? According to the analysis of doctors, generally, when sleeping at night, the facial nerve is at the time of the most relaxation and the lowest resistance. If it is stimulated by the cold stimulation of wet hair, it is easy to affect the facial nerve behind the ear, leading to local spasm, so as to induce facial paralysis. The warm weather in summer may not be so obvious, while the cold weather in winter has a great chance of causing facial paralysis.
harm 2: cause cold
traditional Chinese medicine believes that people’s Yang is the weakest at midnight. After a day’s consumption, women are prone to physical and mental fatigue, and their ability to resist wind and cold is also reduced. Therefore, if after washing your hair with hot water before going to bed, the expanded capillaries are stimulated by the outside world, and the Yang Qi of the head condenses when it is cold, the body will be frozen.
moreover, after shampoo, a large amount of water will evaporate from the head, which will take away a lot of heat from the body. If the immunity is low, heat dissipation will shrink the capillaries of the upper respiratory tract and reduce the local blood flow.
if the resistance of the upper respiratory tract is reduced, bacteria and viruses may take advantage of it, causing upper respiratory tract infection and cold symptoms, such as runny nose, stuffy nose, headache and even fever. It’s easier to sleep with a cold.
harm 3: possible headache and dizziness
the main cause of headache is & mdash& mdash; The long-term retention of water on the scalp surface will lower the scalp temperature and affect the blood circulation of the brain. Therefore, when you sleep until midnight, you may feel numbness in some parts of the scalp, accompanied by continuous pain. In the early morning of the next day, it is more likely to have inexplicable headache or dizziness, and severe cases feel nausea.
in the long run, it may even trigger a phenomenon called & ldquo; Inferior scalp phlebitis & rdquo; The disease of.
Harm 4: bacterial breeding of pillows
pillows are easy to breed bacteria when they are kept indoors for a long time. If you go to bed without dry hair, the moisture on the wet hair will penetrate into the pillow core. After a long time, the pillow core turns yellow naturally.
the pillow material that people often sleep is easily damp and moldy. The humid environment is more conducive to bacterial growth. In this way, the pillow has become a bacterial incubator, and its harm can be imagined. Although this sounds a little alarmist, the fact is so cruel.
harm 5: damage hair quality hair style
hair sleeping wet is a devastating blow to hair style! When I got up the next morning, my hair was definitely in a mess. Knotting was inevitable. I had to cut it constantly and manage it disorderly.
why? Because the hair will be rubbed and squeezed during sleep, it is easy to be bent into various shapes. Once the hair is dry, the softness decreases, so it is shaped, which becomes a big problem that can not be solved by combing. Moreover, in this case, the process of combing hair is more likely to cause hair fracture and damage hair quality. More seriously, a lot of hair will be lost. Your hair has fallen off a lot, be careful & ldquo; Extremely smart & rdquo;, Heartache.
Methods to dry hair quickly after shampoo:
1. Shampoo without conditioner
conditioner may be indispensable for people with dry hair, but it is not necessary for others every day, When conditioner moistens your hair, it is equivalent to smearing a layer of oil on your hair to make the water evaporate slowly. If you happen to be busy late and have to wash your hair, don’t use conditioner.
2. After washing the head, try to wring the water
. Gather the hair into a bundle and pinch it to make a lot of water, so that the shampoo cap will not be full of water at once. Then break up the hair, so that the water droplets adsorbed between the hair can also flow down. At this time, you can comb it with a comb, and then gather back a bunch of water and pinch it again.
3. Hair tossing
throw out the residual water drops through hair tossing. People with anemia or easy dizziness should pay attention not to throw too hard. In addition, pay attention to stand firm during the tossing process.
4. Use a water absorbent hair cap
. The material of the water absorbent hair cap has good water absorption and can effectively absorb the water of the hair. At the same time, the design of the hair cap can better and more conveniently wrap the hair, which is very convenient to use.
5. Use a large towel to absorb water
. When the absorbent hair cap is wet, change a large towel to wrap the hair again. Pay attention to scatter the hair so that the towel can better absorb the residual water in the hair. Moreover, wrapping the head in this way can also prevent the head from blowing into the wind and getting cold.
6. Comb your hair by hand
the large towel can absorb limited water and can’t get wet. Therefore, according to your own situation, you can disperse your hair by combing your hair by hand and then press your hair with a towel to absorb water. It can also be used as a massage for yourself.