Yawning and sleepiness are generally due to low oxygen concentration in the body. When nerve cells perceive a decrease in blood oxygen concentration, they will speed up and deepen their breathing to get more oxygen and increase blood oxygen concentration. Usually may be due to poor sleep, mental stress and other physiological factors caused by the situation, may also be due to brain ischemia and hypoxia and other diseases. 1. Physiological factors: Poor sleep quality or excessive mental stress will make it difficult to enter deep sleep, and waking up many times during the night will affect the spirit, making you sleepy during the day and yawning constantly. It is recommended to have a reasonable work and rest schedule, avoid overwork, and exercise appropriately. 2. Hypoxic-ischemic encephalopathy: insufficient cerebral blood supply caused by cerebral arteriosclerosis may also lead to frequent yawning and sleepiness, and it is recommended to improve the head CT or cranial MRI for further clarification. It is recommended to actively control blood pressure, blood sugar, blood fat and other risk factors, regular review, and treatment under the guidance of a doctor. 3. Cervical spondylosis: cervical spondylosis may lead to insufficient blood supply to the vertebral artery, stimulate the body’s reflex center and yawn, take a deep breath, and promote blood oxygenation. If the symptoms persist or have frequent attacks, it is recommended to seek timely medical treatment for targeted treatment.