The Caffeine... It Does Nothing!

I don't know if it's a product of my weird metabolism or simply tolerance from long exposure, but caffeine has very little effect on me. Occasionally it might make me a bit more alert, but even then the results are minor. More often, either there's no effect, or I actually get sleepier!

I suspect it's metabolism more than exposure. Several years ago I was taking a drug which I was warned had the side effect of "making a person feel wired, like several cups of strong coffee." It made me so groggy I was afraid to drive!