system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I know that caffeine blocks adenosine receptors without activating them but I didn't understand the language of why that stops us from feeling tired, how does that work?
gpt
When you're awake, that adenosine builds up and when the receptors sense enough of it, it slows down neurons and other things so yo8 get tired. However, when the caffeine blocks these receptors the brain doesnt know that its tired. Sort of like when your sprained ankle hurts and you take advil, it just blocks the pain receptors so they dont tell your brain you're in pain (even though whatever happened to your ankle is still affecting it like a bruise or fracture).