The Stock Market Gains More When It’s Closed Than Open. It’s Literally Night and Day.

If only traders could make money in their sleep. Well, it turns out, that’s exactly when most of the money in the market is made.

According to data from Bespoke Investment Group, a strategy of buying the SPDR S&P 500 exchange-traded fund (ticker: SPY) right before the close each day and selling at the following day’s open would have trounced the opposite strategy—buy at the open, sell at the close—since the ETF’s inception in 1993.