Sleepiness after a booster shot is usually caused by an adverse reaction to the vaccine or mental stress, which is usually normal, but if the drowsiness is severe, prompt medical attention is needed. The new crown vaccine is generally inactivated vaccine, so after the vaccine, depending on the individual physique, some people will not have any reaction, some people will be sleepy, fatigue, fever and pain at the injection site, and even severe drowsiness, dizziness, headache, nausea and vomiting and other symptoms, if the symptoms are mild will generally be relieved on their own, the symptoms continue or aggravated need to go to the hospital for medical treatment. There are also some people who are too worried about the adverse reactions of the vaccine before vaccination, resulting in sleep deprivation, and start to be sleepy after the vaccine, or too nervous when playing the vaccine, and will be sleepy after the vaccine is administered in a relaxed state of mind, but these are normal phenomena that will not cause great harm to the human body, and can be relieved after resting, so there is no need to worry too much. Universal vaccination can form a good barrier against the epidemic, and is a very important way to fight against the new crown pneumonia nowadays. In order to minimize the adverse reactions after vaccination, need to stay 30 minutes after vaccination, after going home, need to adjust the work and rest and diet structure, try not to stay up all night, do not eat spicy and stimulating food, do not smoke and drink. [Tip] This article refers to the “new coronary pneumonia, new coronary virus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to “new coronary virus infection”.