How to make money from stocks — while you sleep MarketWatch 2 hrs ago FA CENTER The early bird doesn’t just get the worm. It also gets the bulk of the stock market’s profits. That’s because most of the S&P 500’s gains occur overnight. The U.S. benchmark index on average barely gains while the New York Stock Exchange is open. That’s the finding of a recently updated study entitled “Market Return Around the Clock: A Puzzle.” Its authors are Oleg Bondarenko of the University of Illinois at Chicago and Dmitriy Muravyev of Michigan State University. The professors analyzed tic...