According to the text, caffeine is a(n) inhibitor.

Adenosine

Explanation:

According to the text, caffeine is a(n) _Adenosine_ inhibitor.

Adenosine is chemical secreted in the body that felicitates sleep and dilates the blood vessels, probably to ensure good oxygenation during sleep. Whereas, Caffeine acts as  an adenosine-receptor antagonist. which means that it binds to these receptors, but it does not reduce the neural activity.

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