I have monitored my caffeine intake for quite a while and keep it down to 1-2 cups a day. For the past week or so, I find it extremely beneficial at around 3-4

I have monitored my caffeine intake for quite a while and keep it down to 1-2 cups a day. For the past week or so, I find it extremely beneficial at around 3-4 pm when it gives me the boost required for me to shift from low energy items to high concentration items. I guess it might be possible to work without caffeine, but you would have to get a trigger to switch yourself from low energy to high energy zone, good substitutes could be a walk, workout, a game of foosball etc.