No.1 Coffee drinks: Coffee contains caffeine, which has a certain excitatory effect. The disadvantage is that it is not convenient, instant need to brew water, and there is not always hot water around.

No.2 Functional Drinks: Functional drinks have a variety of nutrients, including a variety of vitamins, lysine taurine, inositol, and caffeine, etc., which have a refreshing effect. The disadvantage is: the high content of caffeine, can make people in a sustained state of high excitement, and thus easy to ignore their own fatigue, resulting in physical overdraft.

No.3 Tea drinks. Tea contains caffeine, which can play an exciting role. And tea drinks are processed, good taste, suitable for flat times water to drink, but the caffeine content in tea drinks is much lower than tea, refreshing effect is not obvious.

No.4 cold drinks: mainly carbonated beverages, such as seven happiness, Sprite, Coke and so on. Carbonated gas in these drinks makes the drinks have a special flavor, drinking can give people a refreshing taste, especially chilled cold drinks, can improve the brain's excitability, to avoid drowsiness. The stimulation given by cold drinks is often only momentary and should not be consumed more than once, otherwise it can cause diarrhea, abdominal pain, sore throat and other uncomfortable symptoms. This method is not very suitable for work, driving, study, exam fatigue with.

No.5 Cool Food: It can give people a brief sense of coolness, but also wake up the brain, produce a feeling of refreshing, and eliminate drowsiness. The disadvantage is that it can not solve the difficult feeling after being sleepy, people are more awake, but the brain is still very sleepy and difficult feeling. It is worth mentioning that mint candy or mint-flavored gum should not be consumed at the same time as carbonated drinks. Otherwise, it will make the carbon dioxide in the drink quickly released, easy to cause gastric distension, carbon dioxide poisoning and other adverse reactions, and even life-threatening.