It’s true that coffee boosts energy because it excites the sympathetic nerves. Coffee mainly contains caffeine, and caffeine into the human body will lead to sympathetic nerve excitation, inhibit the parasympathetic nerve, so as to play the role of refreshing. Although coffee has a refreshing effect, it is not recommended to drink too much coffee. Coffee belongs to a kind of beverage, excessive intake of coffee may lead to excessive secretion of gastric acid, and the patient may experience abdominal distension and other uncomfortable symptoms. It is not recommended to drink coffee if the patient has a history of insomnia. When coffee excites the nerves, it may affect the ability to fall asleep at night, leading to sleep disorders and affecting the next day’s work, life and study.