Why caffeine keeps us awake
In the human body, caffeine acts as a stimulant for the central nervous system. It keeps us awake by blocking one of the body's sleep-inducing molecules, called adenosine.
Your body gets its supply of energy by breaking down ATP, a high-energy molecule. In the process, adenosine is released. When adenosine docks at the receptors in your brain, it activates a cascade of biochemical reactions that makes your neurons fire more slowly, making you get sleepy.
Caffeine interfears with this process of slowing your neurons.
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Caffeine is a stimulant, which means it increases activity in your brain and nervous system. It also increases the circulation of chemicals such as cortisol and adrenaline in the body. In small doses, caffeine can make you feel refreshed and focused.
Keeps you awake making some sleep de...
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