There is evidence of a developed dependency among users as well as evidence for caffeine withdrawal symptoms. So, in that sense it can be considered addictive. Caffeine impacts the same parts of the brain as cocaine: the Brain Reward System. However, the effects are somewhat different and not nearly as pronounced as those from cocaine. Caffeine is said to have a half-life of about 6 hours. Therefore, if you drink caffeinated coffee with dinner at 6:00 pm, 50% of the caffeine is still in your brain and body at midnight. For some individuals caffeine can cause heart palpitations, insomnia, or anxiety. Therefore, if you want a good sleep, it might be wise to limit your caffeine intake after lunch.
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