Why Do You Need More Than One Cup of Coffee a Day?

Caffeine blocks a certain compound called the dentacy and that has a relaxation effect on your, your blood vessels. So if you have a lot of a dentacy built up within your body because you don't drink any form of caffeine, then you find it very easy to fall asleep. If you just constantly consume caffeine in the form of coffee, which most people do, then you're blocking that effect from happening,. The half life would actually be like eight to 10 hours.