There are often many patients who feel sleepy during the day without energy themselves for the following reasons: 1. Because of poor sleep quality at night, the sleep time is too short. Some patients spend too much time looking at cell phones and computers during the day and sleep late, resulting in short sleep time at night and daytime sleepiness. 2, obese patients, most of whom are accompanied by sleep apnea syndrome, often snore during sleep, airflow is not available, there is a feeling of suffocating awake, resulting in poor sleep quality. 3, some patients with neurasthenia and depression, always feel that they have no energy, sleepy, not clear-headed and mentally uninspired. 4.Patients with severe anemia and malnutrition and insufficient protein intake can also lead to symptoms of lack of energy and sleepiness. 5.Patients with insufficient blood supply to the cerebral arteries, mostly seen in the elderly, mostly accompanied by hypertension, diabetes, hyperlipidemia, accompanied by cerebral arteriosclerosis and narrowing of blood vessels, can have symptoms of insufficient blood supply to the cerebral arteries and symptoms of lack of energy and sleepiness. To sum up, feeling weak and sleepy during the day may be caused by some organic diseases, and targeted examinations should be conducted to clarify the diagnosis for treatment.