Coffee and sleep caffeine content has nothing to do with concentration.

"Let's go to the coffee shop for a cup of coffee in the evening!" Many people will look embarrassed to hear such an invitation. Lying awake in bed after drinking coffee, with the terrible memory of being unable to sleep for a long time with our eyes open, makes us avoid caffeine. In fact, this is our biggest misunderstanding about coffee, not all coffee will affect sleep.

Generally speaking, coffee tastes very strong, which refers to the flavor of coffee, because the flavor of coffee comes from the ingredients of coffee beans rather than the amount of caffeine. Coffee beans are a kind of fruit containing vegetable oils, and the volatilization of oil is the main cause of the overall aroma of coffee, so it is not proportional to the content of caffeine. Many people think that espresso Espresso has more caffeine, but in fact, the amount of espresso is small and the brewing time is short, so the caffeine is lower than that of ordinary coffee. Through the study, we know that if the coffee beans are in the process of conditioning and brewing, the longer they are soaked in water, the more coffee will be extracted from the coffee powder and the higher the caffeine will be. For example, espresso Espresso brewed for only 20 seconds, the caffeine content is naturally lower, while short-time brewed coffee has less caffeine than long-time dripping coffee. Coffee brewed at low temperatures is also less caffeinated than coffee brewed at high temperatures. TIPS: we generally think that black coffee contains more caffeine than instant coffee, but in fact instant coffee is made from Robbota beans with higher caffeine content, and considering the refreshing destination of consumers. So instant coffee contains much more caffeine than other coffee.