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==Introduction==
==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.
Caffeine is the most widespread psychoactive drug in the world <ref>Burchfield G (1997). Hopes M (ed.). [https://web.archive.org/web/20090726194701/http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm "What's your poison: caffeine".] Australian Broadcasting Corporation. Archived from the [http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm 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.
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.
While caffeine both does induce a number of scientifically validated positive and negative effects on humans for a short time after consumption, withdrawal symptoms are possible in the case of caffeine dependence and are recognized by the ICD-11 and DSM-5.
For the purpose of adapting to Polyphasic sleep, the community discourages the intake of caffeinated beverages due to the ability of caffeine to disrupt sleep, decrease the amount of SWS sleep in a sleep block and mask sleep deprivation symptoms during the adaptation period. The long half life of caffeine (particularly contained in coffee), significantly outlasts both the perceptible cognitive boost and the inevitable following caffeine crash.
==References==
==References==
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