Read Labels? 

Every once in a while, there comes this time. The time to stop taking preworkout for at least a week. It sucks, I know, since it is such a help to you when you’re feeling too tired to go to the gym.

However, your body is going to build a tolerance to caffeine and you will just be getting diminishing returns if you don’t take at least a week off. It also stresses it on the labels of most preworkouts. My suggestion is go ahead and take that week off when you feel it’s needed or when the label suggests, and it can only help you in the long run.