At present, students and other groups of white-collar work pressure, a heavy daily workload, often early in the morning and late at night, wearing the stars, serious lack of sleep, due to site constraints, generally will choose after lunch, lying on the table for a short nap to relieve fatigue through sleep. In fact, a proper lunch break can not only soothe our cardiovascular system, but also to make the human body tension is reduced to the brain-based students and urban white-collar workers can experience a lunch break after the efficiency greatly improved, but lying on the table nap is not conducive to our physical health. So, long-term lying on the table nap in the end what are the hazards? 1, prone to cervical spondylosis because buried head will lead to the curvature of the cervical spine and the opposite of the normal physiological curvature, the shoulder and neck muscles will also be kept for a long time in a non-constant posture and stiff, so it is easy to suffer from cervical spondylosis. Long-term arm as a pillow, but also lead to shoulder pain, arm pain, radial nerve pressure injury and other diseases. 2, affect breathing Because of this posture to increase the body curvature, compression of the heart and lungs, increasing the burden on the heart and lungs, resulting in poor breathing, the thorax can not be well stretched, the body’s oxygen supply will naturally not be sufficient. Female compression of the chest posture will also induce a variety of heart or breast disease. 3, affect the digestive system in general people eat more lunch, and digest the food takes about 3 hours. After lunch on the table nap will increase the burden of gastric peristalsis, easy to cause gastric distention, reduce the ability to digest food, thus affecting the absorption of nutrients. In the long run, it is easy to suffer from gastritis. 4, aggravate the brain ischemia After sleeping, the human heart rate will gradually slow down, the flow of blood through the tissues is also relatively slow, the inflow of blood to the brain will be reduced than usual. After lunch more blood to enter the gastrointestinal tract, to help digestion, sleep on your back will aggravate the brain ischemia, eventually leading to dizziness, tinnitus, leg weakness and numbness and other symptoms. 5, compression of nerves when the head for a long time pillow on the arms, will be long-term compression of the arms and face, so that the blood circulation in the arms is blocked, nerve conduction is affected, it is easy to appear two arms, face numbness, pain and other symptoms, over time will become nerve paralysis or make the face deformed. 6, affect vision and sleep voluntarily often wake up with temporary blurred vision, which is due to the pressure on the eyeballs when sleeping voluntarily, resulting in high intraocular pressure. For a long time, it will make the eye bulge, eye axis growth, poor vision. 7, radiation damage to the skin Office people tend to lie on the desk for a while, some people will turn off the screen, but the host of radiation still exists. Radiation will intensify the evaporation of moisture from the skin surface, thus making the skin dry, for spots, acne and acne growth provides a convenient condition, intensifying the degree of skin aging. Dull skin, easy to spot, large pores, external oil and internal dryness are the characteristics of “computer muscle”. Therefore, when you go to bed at noon, you should make a good habit of turning off your computer. And, daily exercise, healthy diet, also help to fight radiation. How to nap correctly? Lunch should not immediately nap, should generally rest for ten minutes after eating and then nap, to avoid causing cerebral blood supply deficiencies when napping, it is best to lie down who, if not, you can pad a soft cushion or pillow in front of the chest as a buffer, rather than the head directly on the arms. Wake up and move around lightly. After the nap, you should slowly stand up and drink a glass of water to replenish the blood volume and dilute the blood viscosity. Do not engage in complex and dangerous work immediately because of the sense of trance that often arises when you first wake up.