Caffeine is a stimulant that acts on the central nervous system, including the brain. It works by blocking the action of a neurotransmitter called adenosine. Adenosine normally binds to adenosine receptors in the brain, which slows nerve cell activity and promotes drowsiness.
Huberman suggests waiting 90 to 120 minutes after you wake up before you consume coffee.
1) Let your natural cortisol response wake you up (natural circadian rhythm)
2) Lets your adenosine levels rise slightly so caffeine is more effective
Waiting 90 minutes after waking up allows adenosine levels to rise slightly, making caffeine more effective at blocking receptors and keeping us alert throughout the day.
3) Reduce your overall caffeine dependence
Early caffeine consumption can lead to increased dependence because the body relies less on its natural cortisol release.