* * * A variety of studies, polls, and anecdotal evidence show that increasing numbers of professionals and students are using various drugs to sharpen their attention at work or school, reduce their sleep time, or calm their nerves. * * * Industry advocates say that researchers will soon deliver more drugs capable of goosing workers' performance, and that the improvement will be enough to make a real difference to company profits and workers' pay. Industry lobbyists are seeking hundreds of millions of dollars for research that will accelerate these developments, and millions of dollars to win public acceptance for...