Later will come the 'Mousetrap' play, which Hamlet designs to "catch" Claudius.  Ergo, at that time of the 'Mousetrap' play, Claudius is the "mouse."  Tomorrow night, we will hear a lot of noise, from here on the platform, as Claudius carouses.  Tonight however, the "mouse" Claudius must be asleep, or at least he isn't having the drums and trumpets sound, and the cannons fire while he gets drunk.  So, knowing the future events, Francisco's line can be read in that roundabout way as an observation that Claudius isn't stirring.  The Francisco character, himself, isn't trying to say that, but Francisco didn't write his own lines, and the man who did knew the whole play.

Later will come the 'Mousetrap' play, which Hamlet designs to "catch" Claudius.  Ergo, at that time of the 'Mousetrap' play, Claudius is the "mouse."  Tomorrow night, we will hear a lot of noise, from here on the platform, as Claudius carouses.  Tonight however, the "mouse" Claudius must be asleep, or at least he isn't having the drums and trumpets sound, and the cannons fire while he gets drunk.  So, knowing the future events, Francisco's line can be read in that roundabout way as an observation that Claudius isn't stirring.  The Francisco character, himself, isn't trying to say that, but Francisco didn't write his own lines, and the man who did knew the whole play.