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==Introduction==
Caffeine is the most widespread psychoactive drug in the world <ref>Burchfield G (1997). Hopes M (ed.). "What's your poison: caffeine". Australian Broadcasting Corporation. Archived from the original on 26 July 2009. Retrieved 15 January 2014.</ref> and is contained in large quantities in coffee and, in lower concentration, in other beverages that are regularly consumed to temporally ward of drowsiness or increase mental performance.
The main mechanism <ref>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2769007/</ref> at work with caffeine to achieve the alleviation of drowsiness is by blocking adenosine receptors in the brain that are a part of the sleep regulation mechanism.
==References==
<references />
Caffeine is the most widespread psychoactive drug in the world <ref>Burchfield G (1997). Hopes M (ed.). "What's your poison: caffeine". Australian Broadcasting Corporation. Archived from the original on 26 July 2009. Retrieved 15 January 2014.</ref> and is contained in large quantities in coffee and, in lower concentration, in other beverages that are regularly consumed to temporally ward of drowsiness or increase mental performance.
The main mechanism <ref>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2769007/</ref> at work with caffeine to achieve the alleviation of drowsiness is by blocking adenosine receptors in the brain that are a part of the sleep regulation mechanism.
==References==
<references />
