Caffeine is very similar to Adrenalin, Ephedrine and other similar compounds. So it has a stimulating/awaking effect on the human anatomy.
I can't function with out my first cup of coffee in the morning :) I get extremely irritable and head pains... I had no idea how addicted I was to cafine until one day my kerig broke down and I was whacking it with a butter knife in a temper fit of rage :/
Half cup 🍵 or less and I'm up for 2 days, my heart is beating 500 miles a second and then I'm hyperventilating, scared and freaking out.
I stay away from coffee and caffeine.
Sometimes caffeine is good to do sports