| http://www.w3.org/ns/prov#value | - Withdrawal symptoms ??? possibly including headache, irritability, an inability to concentrate, and stomach aches[citation needed] ??? may appear within 12 to 24 hours after discontinuation of caffeine intake, peak at roughly 48 hours, and usually last from one to five days - representing the time required for the number of adenosine receptors in the brain to revert to normal levels, uninfluence
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