Coffee is a food, not a drug, and does not have the same effect as a drug. For some people, it can have a certain effect such as refreshing. If you feel unwell, please consult a doctor.
Coffee has caffeine, can play a certain degree of excitation of the role of the nerve center, but do not recommend drinking a lot of long-term, otherwise it is likely to dependence, some discomfort symptoms.
Although coffee has certain benefits, but also need to drink coffee in moderation, sleep quality itself poor crowd before going to bed try not to drink coffee, so as not to affect sleep. If you need to know more about healthy coffee consumption, it is recommended to consult the nutrition department of a formal organization.