I agree with Ash. Depending on the workout and your goals you could just have the normal Reactivate which has carbs. Alternatively you could have some sort of protein carb shake. The important thing is to get something in that you can tolerate before you train. I like to have a warm shower before i train in the morning because my back can be stiff but you can also finish with just cold which certainly wakes you up. However, i wouldn’t be too concerned about whether you are weaker due to CNS etc. Mentally that just puts excuses in your head. There are plenty of people who get strong lifting early in the morning and its something i believe your body gets use to.
Cheers
Damian