1. Getting angry before bed: Getting angry or upset before going to bed can lead to an increased heart rate, rapid breathing, and a whirlwind of thoughts, making it difficult to fall asleep.

2.Eating a full meal before bed: Eating too much before bed forces the stomach and intestines to work harder to digest food, and a full stomach can continuously stimulate the brain. With areas of excitement in the brain, one cannot sleep peacefully, as traditional Chinese medicine says, "If the stomach is not at peace, then sleep is uneasy."

3.Using a pillow that's too high: From a physiological perspective, a pillow height of 8 to 12 centimeters is appropriate. A pillow that is too low can cause "stiff neck" or excessive blood flow to the brain, leading to a swollen head and puffy eyelids the next day. A pillow that is too high can affect the smoothness of the respiratory tract, causing snoring, and long-term use of high pillows can lead to neck discomfort or hunchback.

4.Sleeping with hands under the head: Sleeping with both hands under the head can affect blood circulation, causing numbness and pain in the upper limbs, and can also increase abdominal pressure, potentially leading to "reflux esophagitis" over time.

5.Sleeping with jewelry: Some women have a habit of sleeping without removing their jewelry, which is dangerous. First, some jewelry is made of metal, and long-term wear can cause chronic absorption leading to cumulative poisoning (such as aluminum poisoning). Second, some luminescent jewelry can emit radium radiation, which, although weak, can lead to adverse effects over time. Third, sleeping with jewelry can hinder the body's circulation and metabolism, which is also why the skin around the jewelry tends to age faster.

6.Sleeping slightly drunk: With changes in lifestyle, the nightlife of young women has become more abundant, especially for professional women with more social engagements, often going to bed slightly drunk. Medical studies have shown that sleeping after drinking can lead to sleep apnea, about 2 times per night, each lasting about 10 minutes. Over time, this can lead to heart disease and hypertension.

7.Sleeping with makeup on: Some women, especially young women, do not remove their makeup before going to bed. Makeup residue on the skin can clog pores, causing sweat gland secretion disorders, not only easily inducing acne but also accelerating skin aging over time.

8.Sleeping with a bra on: Bras are meant to protect the breasts, but sleeping with a bra on can lead to diseases, especially the induction of breast tumors. Research by experts has found that women who wear bras for more than 17 hours a day have more than 20 times the risk of developing breast tumors compared to those who wear bras for shorter periods or not at all. This is because the breasts are under pressure for a long time, lymphatic flow is obstructed, and harmful substances remain in the breasts.

9.Drinking tea before bed: Tea contains substances like caffeine that stimulate the central nervous system and make people excited. Drinking tea before bed, especially strong tea, makes it harder to fall asleep.

10.Engaging in intense exercise before bed: Intense activity can leave brain nerve cells in an excited state, and this excitement will not calm down in a short time, preventing one from falling asleep quickly. Therefore, it is best to keep the body calm before bed.

11.Sleeping with the head covered: Because it is cold, many people are afraid of catching a cold and like to sleep with their heads covered. However, sleeping with the head covered can cause difficulty breathing, and as the concentration of carbon dioxide in the quilt increases and the oxygen concentration decreases, long-term inhalation of damp air can be very harmful to the brain. Over time, this can lead to oxygen deficiency, poor sleep, nightmares, and feelings of dizziness and fatigue upon waking.

12.Breathing through the mouth while sleeping: Closing the mouth while sleeping is the best way to conserve vital energy, while breathing through the mouth can not only吸入 dust but also easily expose the trachea, lungs, and ribcage to the stimulation of cold air.

13.Sleeping facing the wind: The human body's ability to adapt to environmental changes is reduced during sleep. Sleeping facing the wind can lead to catching a cold. Therefore, the sleeping area should be away from the wind, and the bed should be kept at a certain distance from windows and doors.

14.Sleeping while sitting: Many women are very tired after work and feel extremely fatigued after eating. They sit on the sofa and start dozing off. However, sleeping while sitting can slow down the heart rate, cause blood vessels to dilate, and worsen brain oxygen deprivation, leading to dizziness and tinnitus.

15.Sleeping face to face: Some family members, such as couples or mother and child, often sleep face to face. This can lead to one party inhaling mostly the exhaled air from the other, resulting in a lack of fresh oxygen or insufficient oxygen supply to the brain, which can also lead to insomnia, nightmares, dizziness, fatigue, and low spirits upon waking. Due to different sleeping habits, actions like pulling the quilt, kicking legs, and snoring can cause the quilt to slip off, leading to colds and affecting sleep.

16.Sleeping with the shoulder exposed: Some people are accustomed to sleeping with their shoulders exposed outside the quilt. However, in winter, the cold weather can easily allow wind and cold to invade the shoulder joints, leading to local blood stasis in the meridians and bones, difficulty in circulation, rheumatism, arthritis, and joint swelling and pain. Exposure to wind and cold can also lead to colds, runny noses, difficulty breathing, and headaches.

17.Sleeping with an electric blanket on all night: Sleeping with an electric blanket on all night can not only make one feel dry-mouthed and parched upon waking but also increase the risk of catching a cold. The ideal temperature for a bed when one is asleep is 33-35°C, with a relative humidity of 55-60%. In this "micro-environment," a large number of blood vessels in the skin are constricted, blood flow slows down, allowing the body to rest and adjust fully. If the electric blanket is heated for too long and the temperature inside the bed remains too high, skin blood vessels will dilate, blood circulation will speed up, breathing will become deeper and faster, and the ability to resist germs will decrease, leading to a cold. Therefore, the correct way to use an electric blanket is to plug it in 10 minutes before going to bed, preheat the bedding, and then turn off the power. As long as one does not feel a sudden chill when getting into bed, it is sufficient.

18.Stockpiling sleep: The human body cannot stockpile sleep. Sleeping a few extra hours to stay up late does not provide much help to the body. In fact, the human body only needs a certain quality of sleep. Sleeping more not only fails to induce sleep but is also detrimental to health.

19.Insufficient sleep: The main way for the brain to eliminate fatigue is through sleep. Long-term insufficient sleep or poor sleep quality will only accelerate the decline of brain cells, and even smart people can become confused.

20.Overdrawing sleep: Some women like to stay up late, even playing all night long. Although they catch up on sleep the next day, the adverse consequences of disrupted biological clocks are unavoidable, leading to daytime drowsiness, difficulty concentrating, and insomnia at night.