I expect this is a placebo effect. It's completely possible to feel more productive without actually being more productive. Looking back on the (admittedly very

I expect this is a placebo effect. It's completely possible to feel more productive without actually being more productive. Looking back on the (admittedly very few) caffeine-fuelled stints I've had they were just more chaotic and overall less productive than drinking tiny amounts of coffee, or no coffee at all.