I noticed that coffee makes me pee way too often whereas I do fairly well with some types of those "tea energy" drinks. Those cans only have 30mg caffeine and my body responds well (prob because of the lower caffeine content).
I drink coffee like no other. There is no way you could get me to stop for an exam. I agree with @"Dr. Yamata".
I had a Monster energy drink in my water bottle for the break as well. I didn't crash at all.
... stim defines navigation as "the animal's ability to find its ... to points familiar to the animal but beyond the immediate range ... of the animal's senses."