Blood clots are the main cause of stroke. Blood clot formation is related to some conditions in life, such as sleeping position and long distance travel. Therefore, it is important to pay attention to regulation in life to prevent stroke from thrombosis. It is well known that long-distance travel for a dozen hours or even dozens of hours of sitting still. Sometimes can appear lower limb swelling, just because in the upright position, sitting position, the lower limb blood return mainly relies on muscle activity on the veins to produce extrusion, and the vein wall has a one-way valve, so that the blood is squeezed back to the heart one section at a time, the lower limbs for a long time inactive and in the sagging position, can make the blood flow stagnation in the local. The elderly, originally suffering from cardiovascular disease, blood flow is slow, more likely to form local thrombosis, therefore, long trips should be walked from time to time, do not sit still for a long time in the same position, long time watching TV should also pay attention to this problem. It is said that most stroke patients are usually accustomed to use to the healthy side of the bed, the reason is presumed to be due to side lying, sleep posture change less, so that the artery distortion pressure, resulting in the original lumen narrowing due to atherosclerosis carotid artery blood flow becomes more slow. In addition, a glass of water before going to bed can make the blood dilution, viscosity reduction, but also help prevent thrombosis.