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Caffeine stimulates the central nervous system, increasing alertness and reducing fatigue.
It takes 6 hours for 50% of the caffeine in your system to be metabolised and 12 hours for 75%. So a full caf afternoon coffee is still in your system at bedtime.
Caffeine can be a mood booster by blocking adenosine receptors and increasing dopamine signalling.
Some people are highly sensitive to caffeine and can feel jittery or anxious even with small amounts, while others can tolerate large doses without noticeable effects.
