Organic coffee contains caffeine which is a substance that hits the brain the moment you take it. When caffeine hits your brain, it suppresses the neurotransmitter known as adenosine. This adenosine influences your attention, sleep, and alertness. It builds up in the brain as your day goes on. The moment the adenosine hits certain level, the body decides it is time to go to bed and sleep. After sleeping, the adenosine will reset and in the following morning you wake up alert and let to do your work.
Caffeine in your body competes with adenosine and binds up to some receptors in your brain. When adenosine is blocked, caffeine keeps your cell running, hence making you awake. As caffeine blocks adenosine, chemicals such as dopamine and glutamate join the party and flow more freely giving you the surge of energy, slowing age-related mental decline, and improving mental performance. It also increase the serotonin, which is the major influencer of mood. The boost will also make you feel positive and strong enough to affect depression.