The causes of sleepiness may be high blood pressure, sleep abnormality, mental illness, etc., so sleepiness is not necessarily caused by high blood pressure. 1. Hypertension: Patients suffering from hypertension for a long time may cause atherosclerosis, which leads to insufficient blood supply to the brain, thus causing the phenomenon of sleepiness. 2. Sleep abnormality: some patients suffer from insomnia or frequent dreaming at night, poor sleep quality or sleep apnea syndrome, etc., which may lead to sleepiness during the day due to insufficient sleep at night. 3. Mental illness: such as depression, anxiety and other mental illnesses, taking antidepressants may appear always sleepy symptoms. Always sleepy may also be caused by elevated blood glucose, elevated blood lipids, etc. If the symptom is not relieved or continues to worsen, you should consult a doctor in time for active treatment.