The conversation between human and AI assistant.
Why does coffee make me sleepy instead of active?
That's interesting. How does caffeine work in our bodies?
Caffeine is a stimulant that works by blocking the action of adenosine, a neurotransmitter that promotes sleep and suppresses arousal. This leads to increased levels of other neurotransmitters like dopamine and norepinephrine, which can have a stimulating effect on the brain and body.