Hanging ear coffee. Ear-hanging coffee is a very common kind of coffee in life. It contains more caffeine, which can stimulate the central nervous system, relieve fatigue, improve symptoms such as poor mental state, headache or dizziness, prevent fatigue and drowsiness, and help improve work efficiency. Coffee is a drink made from roasted and ground coffee beans. As one of the three major drinks in the world, it has become the main drink popular in the world together with cocoa and tea.