With Mariano as a closing pitcher, and I've watched many Yankee games, it normally meant "LIGHTS OUT" for the opposing team, when he took the mound in the final innings. Sandman was also a reference to Mariano.  The sandman comes right before you fall asleep. That's the connection I get with DREAMS. Just taking a stab at this.  So is he signaling  the end of Pelosi and the rest of them?