Totally agree that caffeine can have a huge impact on energy.
I used to drink very strong coffee first thing in the morning (probably equivalent 3-4 shots of espresso), be highly productive until mid-morning, crash, have lunch, then do it again in the afternoon.
This cycle was terrible and eventually I broke it by reducing caffeine. Now I drink green tea 3-4 times a day - a light boost without any of the accompanied cratering. Takes at least a month to get used to, though.
I used to drink very strong coffee first thing in the morning (probably equivalent 3-4 shots of espresso), be highly productive until mid-morning, crash, have lunch, then do it again in the afternoon.
This cycle was terrible and eventually I broke it by reducing caffeine. Now I drink green tea 3-4 times a day - a light boost without any of the accompanied cratering. Takes at least a month to get used to, though.