I bet volume completely dries up for the next few hours. What else is there to do today but sit back and relax? Every day you get handed gains without having to do anything but buy the dip. How easy can it be? There are no sellers, certainly no short sellers, they are afraid of the Fed and ECB.
The Fed is juicing this market every day. It all started when the ECB warned not to short the Euro two days before the Olympics started. This is the result, no volume in equities, no shorts in the market so it can only go up.