(meth-)amphetamines during the day, benzos in the night.

scientifically speaking, isn't this the ultimate lifehack? you're pushing your brain's clockrate to the maximum, running at 100% during the day then tune it down to 0% frequency and let your braincell cool down during the night. boom repeat till you're 90, then retire. why is this combo not openly encouraged by the FDA? obviously all high achieving people are on it? they just want the plebs to suffer?