Feeling sleepy, no spirit is caused by the following factors: First, the most common factor is high blood viscosity and hyperlipidemia, usually hypertriglyceridemia and cholesterolemia is too high and caused by sleepiness, no spirit, body tired clinical symptoms; Second, insufficient blood supply to the large arteries, the most common factor is coronary artery hypoperfusion of heart disease, often due to myocardial ischemia caused by the lack of blood supply to the periphery, so feel weak, sleepy, no spirit; Third, usually due to the lack of oxygen to brain cells, such as pulmonary hypertension, hypertension and other factors, arterial blood oxygen saturation is reduced. The most common factor is coronary artery hypoperfusion heart disease, which is often caused by myocardial ischemia, resulting in insufficient blood supply to the body, and thus making the patient feel tired, sleepy and lack of energy; thirdly, it is usually caused by the lack of oxygen in the brain cells, and the lack of oxygen in the brain cells can be caused by factors such as pulmonary arterial hypertension, hypertension, and so on, which reduces the arterial oxygen saturation level, the partial pressure of oxygen is too low and that of carbon dioxide is too high, and therefore makes the patient feel sleepy, lack of energy and tiredness; fourthly, the endocrine and metabolic disorders, for example, the above mentioned clinical symptoms may occur in cases of hypothyroidism.