The V.A. diagnosed me with A.D.H.D., but all that Ritalin did was cause me to fail my urinalysis with the National Guard.
I am a very calm person. Is this with or without amphetamines?
Ritalin, or something like it, supposedly helps everyone. People with it improve. People without it gain super powers.
I have not figured out what caffeine does for me, either. One time I was driving my family to Phoenix, I had difficulty staying awake, and so I drank at least two litres of diet Coke.
I felt like I had a worse time staying awake, but there is no way to know.