Caffeine induces a slightly elevated mood, alertness, sensitivity of touch, smell, sight, and hearing. It can also cause nervousness, irritability, insomnia, tremors, and depression. The physical effects can include constricted cerebral blood vessels, increased blood flow in the body, heart stimulation, increased basal metabolic rate, limited glucose metabolism, relaxation in some smooth muscles, and increased urine flow.
Caffeine also shortens sleep time, reduced depth of sleep, increases ear...
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