Coffee is a widely used beverage. Drinking coffee will have an exciting effect and is often used to refresh yourself. But the function of coffee varies from person to person, such as tolerance, absorption, physical state and so on. Drinking coffee may not be irritating, and occasionally individuals will be sleepy, especially those with specific constitutions who are not very sensitive to coffee.
Some people are too tired, jet lag, stay up late, work at night, or lack nutrition, or have some serious diseases, resulting in low body resistance. At this time, the coffee they drink is not exciting, but more sleepy, which is determined by the state of their bodies. Drinking coffee is exciting. Some people use it to refresh their minds, but some people do.
Qualitative problems, state problems, absorption problems, tolerance problems, etc. , will lead to occasional individuals appear more sleepy.