THE TAKEAWAY: Drinking coffee immediately upon waking blocks adenosine receptors before your brain clears overnight sleep pressure, setting up an afternoon crash.
Adenosine builds up in the brain during waking hours and creates sleepiness. While you sleep, your body clears it. When you wake up, residual adenosine remains. If you consume caffeine immediately, it occupies adenosine receptors without clearing the molecule. Once caffeine metabolizes hours later, accumulated adenosine binds all at once, triggering a sharp energy drop. Delaying intake 60–90 minutes lets your body clear residual buildup naturally.
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