According to the theory of Chinese medicine, “ziwu sleep” is a good way to maintain health, “noon” is the body’s meridian gas “with Yang” time, conducive to nourishing Yang. However, a German scholar recently pointed out that 20% overweight, low blood pressure and blood circulation system has a serious disorder of the three types of people napping instead of the disadvantages. “This is not a surprise.” Nanjing Hospital of Integrative Medicine cardiovascular disease specialist Zhang Ming, chief physician said. The key to napping is to vary from person to person and find the right rest time. For overweight people, napping is easy to make obesity increase, may be changed to sleep 20 to 30 minutes before lunch. Zhang Ming, cardiovascular department of Nanjing Hospital of Integrative Medicine For people with low blood pressure, nap, the blood flow is slow, the blood itself is viscous and easy to form clots on the walls of the blood vessels, inducing the risk of stroke. Patients with low blood pressure should not nap for a long time, preferably for half an hour. Blood circulation system has serious disorders, especially because of cerebrovascular problems and often dizzy people also should not nap, after a full meal blood rushed to the digestive tract, the skin, digestive tract have to compete with the brain for blood, at this time there is a risk of cerebrovascular accidents. So it is best to drink a glass of plain water before or after half an hour after the meal and then nap. This nap can reduce the risk of cerebrovascular accidents.