I'm the type that get sleepier when i get coffee in the morning, though i don't drink much coffee it may have been not strong enough ones for me now that i think about it
That's normal.
Based on single serving size:
Normal coffee has about 90 to 100 mg of caffeine while soda has 40 mg.
Espresso has 64mg... but you don't really drink that to wake up from caffeine. But rather from much stronger lingering taste.
Starbucks sits aroung 180 to 200 mg which is closer to what energy drinks have which is 160 mg.
Now if you really want to wake up after drinking 1 serving size of coffee, then I suggest you get you try stronger brands.
Fire Department Coffee , Stipe Miocic roast has 500 mg of caffeine
Death Mountain & Death Wish sits at 700+ mg
Devil Mountain sits at 1555 mg
oh and serving size is basically about 5 tablespoons of ground coffee per 12 oz of hot water.
And for a heathly thin person who doesn't drink caffeinated drinks, 400mg is supposed to be the nonlethal amount of caffeine per serving.