The following are the common reasons for lying down on confusion: first, anemia, due to the decline in the number of hemoglobin and red blood cells in the blood, the ability of the blood to carry and transfer oxygen is reduced, resulting in lying down on confusion, mental weakness during the day, fatigue, decreased appetite for food, and shortness of breath after activity. Second, sleep apnea syndrome, mostly seen in obese patients, can be accompanied by abnormal development of the nasopharynx, in addition to lying down on the confusion, there will be dozing, not refreshing, memory loss, snoring at night, and there is sleep apnea in the process of breathing, suffocating awake at night. Third, cerebrovascular diseases, such as cerebral arteriosclerosis, cerebral infarction, after multiple cerebral infarctions and patients recovering from cerebral hemorrhage, due to brain diseases can cause insufficient blood supply to the brain or a decline in brain function, manifesting as confusion when lying down, accompanied by memory loss, comprehension loss, and slow reaction.