|According to the world statistics 69% of the adults consume caffeine every day in the form of energy drink, coffee, soft drinks etc. caffeine is a CNS stimulant. Caffeine antagonizes, or blocks, adenosine receptors. Adenosine is a by-product of cellular activity, and the adenosine receptors play a role in producing feelings of tiredness and the need to sleep. Consequently, the action of Dopamine increases which produces a feeling of satisfaction etc. Caffeine withdrawal produces a unpleasant feelings which differ among individuals. A journal is a periodical publication intended to further progress of science, usually by reporting new research. Most journals are highly specialized, although some of the oldest journals publish articles, reviews, editorials, short communications, letters, and scientific papers across a wide range of scientific fields. Journals contain articles that peer reviewed, in an attempt to ensure that articles meet the journal's standards of quality, and scientific validity. Each such journal article becomes part of the permanent scientific record.