I'm not lazy, it's society that's manically hyperactive.
You know... I meant that as a sort of joke, but it actually isn't too far from the truth. Some manic-obsessive individuals set the tone, and some places are worse than others, South Korea being most famous for it.
A number of clinical trials have shown improved academic and occupational cognitive performance using psychostimulants in therapeutic doses. This includes improved inhibitory control, memory recall, and awakefulness. Some studies have even shown a measurable (4-5 points) increase in performance when taking an IQ test.