The reason for the old love to sleep are the following: 1, due to various diseases leading to brain hypoxia, the general brain hypoxia after the brain nervous system will appear in a state of inhibition, at this time will feel very tired, weak, sleepy, sleepy. 2, may be not well rested and tired at night, many people due to work pressure or mental tension and other reasons caused by poor sleep at night, sleepy, sleepy during the day, 3, old sleepy may be the body suffering from a disease caused by, for example, cerebrovascular disease can damage the brain nerve, will make people appear drowsy situation. In addition, if suffering from hypothyroidism this disease, will lead to a slow metabolism of the whole body, will also make people feel weak and sleepy situation. There are also chronic diseases such as diabetes and hypertension, which can make people feel mentally ill and drowsy.