Daytime sleepiness may be caused by lack of sleep, or it may be due to high blood fat, sleep apnea, rhinitis and other diseases. 1. Lack of sleep: patients who often stay up late, poor sleep treatment, etc., may lead to sleep deprivation caused by daytime sleepiness, which is a normal phenomenon, generally through supplemental sleep can be relieved. 2. Hyperlipidemia: If the patient suffers from hyperlipidemia, it will lead to the slowing down of blood flow in the body, which will reduce the ability of red blood cells to carry oxygen, and lead to cerebral ischemia and hypoxia, and the lack of oxygen in the brain will make the patient prone to sleepiness. 3. Sleep apnea: it is usually caused by obesity and congenital narrowing of pharyngeal cavity. The main symptoms are snoring, daytime weakness and drowsiness. Because of sleep apnea patients in the process of sleep, respiration is temporarily in a state of pause, so that people can not enter a deep sleep, the oxygen content of the blood will be reduced, which may lead to the symptoms of daytime sleepiness. 4. Rhinitis: rhinitis can cause respiratory obstruction, resulting in lack of oxygen to the brain, which in turn causes sleepiness and other problems, rhinitis problems can easily lead to insomnia apnea syndrome, it is recommended that the patient sleep on the nose area for hot compresses, to a certain extent, can improve the local blood circulation. Usually less late at night, keep a relaxed mood, strengthen the body exercise, if the condition is serious should be timely to the hospital for related examination and treatment.