When S&P futures were down 1.5% last night all you needed to know is that it’s Extremely rare for the S&P to not hit positive 3 days in a row. Knowing those market rules would of made you a lot of money.
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Looking back over 500 trading days it only happened once that it did not go intraday positive on 3rd day. That was last month.
For those who have Etrade or Ameritrade you can trade ETF's like the SPY,DIA & QQQ at night. When the futures were down 45 last night, you could of bought this on Etrade from 8pm to 4am.