Caffeine and human physiology

Just as an aside, I checked with a doctor in my health policy program. You know how if you stay awake for 24 hours and then drive, it's like driving drunk? Well, the American thing to do is to drink lots of caffeine. However, that keeps you awake, but your brain is still mush.

By the way, the ER doctors and nurses who have been awake for 24 hours, even if they've had lots of coffee, are essentially drunk.