What causes the huge crash when you consume a caffeine drink like red bull or coffee and how do you prevent it while studying?

Post stimulation: After a stimulating drink, the nervous system is charged for only a short time, then the stimulation eases and the brain hype declines - the crash is proportional to the height of the stimulation -- red bull being powerful that way. How to prevent it: don't drink so much of the powerful stuff - try V8 FUSION ENERGY drinks --= a lot healthier and less likely to cause crash - drink it more slowly