Caffeine helps increases circulation, speeds up a person's thoughts, produces a feeling of well being and could cause nervousness and loss of sleep. The subject of caffeine has been in many cartoons and caffeine is in many foods. There are lots of web pages about caffeine an it has it's own Facebook page. What is caffeine? Chemically speaking it's a plant based alkaloid, which stimulates the central nervous system. So.. how do you drink it, coffee, tea, soda or something else?