Caffeine affects the brain by attaching to adenosine receptors on nerve cells. Adenosine is a natural chemical that builds up during the day and signals the brain to slow down and prepare for rest. When caffeine reaches these receptors, it occupies the same spots where adenosine would normally bind. Because caffeine blocks the receptor, adenosine can no longer deliver its slowing signal. With the calming effect blocked, the neurons remain active and responsive. This increased activity also influ
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