My observations seem to differ. Every now and then I slip into increasing my dose. But, for 90% of the time I drink one shot of espresso in the morning. It keep

My observations seem to differ. Every now and then I slip into increasing my dose. But, for 90% of the time I drink one shot of espresso in the morning. It keeps me alert for most of the day. When I feel a bit bored or lazy after lunch, I'd have another one. If I keep doing that for a week, I realise the days when I don't I get particularly sleepy and low energy. 3 days after sticking to morning coffee only reverts me back to previous energy levels. I'd say if you are disciplined with your dose, it helps just the same as it did when you started drinking it.