FLC TAXIES TOWARD WRONG RWY AND ACROSS A RWY IN THE PROCESS.

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OPERATING AS ACR FLT 'A' FROM MLB TO MCO. BEGAN TO TAXI WHILE FO (PNF) CONTACTED GND FOR TAXI INSTRUCTIONS AND ATC CLRNC. GND CTL CLRS US TO TAXI TO RWY 27L. FO WAS PICKING UP IFR CLRNC AND I STARTED TO TAXI OUT. I TAXIED OUT TXWY R; CROSSED RWY 04 GOING TO WHAT I THOUGHT WAS RWY 27L. THE FO REALIZED MY MISTAKE; AFTER LOOKING UP FROM COPYING CLRNC. I WAS THEN JUST ENTERING TXWY A. HE ASKED IF I WAS GOING TO RWY 27L. I ANSWERED 'YES.' HE SAID I WAS GOING TO RWY 09R. GND CTL THEN CALLED AND ASKED IF THAT WAS US THAT JUST TAXIED TXWY R AND CROSSED RWY 04. I ANSWERED YES; WE WERE TURNING TO TAXI TO RWY 27L VIA TXWY A. TWR TOLD US TO TAXI VIA RWY 04 TO RWY 27L. DEPARTED WITH NO FURTHER INCIDENT. NO OTHER ACFT WERE IN THE AREA AT THE TIME OF THE INCIDENT. OTHER FACTORS: 1) HAD NOT EATEN SINCE XA30 AM -- LOW BLOOD SUGAR; 2) XI25 RPT FOR TRIP. ONLY TIME TO EAT WAS BTWN LEG 4 AND 5; XK49 MIN BREAK (REALLY 34 MINS; 15 MIN BOARDING TIME); 3) ZERO PAX ON BOARD. TRYING TO MAKE UP TIME. RUNNING 6 MINS LATE; 4) BOTH CREW MEMBERS WERE NOT 'EYES OUT' AT BEGINNING OF TAXI. FO WAS COPYING ATC CLRNC; 5) FLT A #5; 3 DAY; 2 NIGHT CONTINUOUS DUTY TRIP FOR MONTH; TOTAL OF 6; 3 DAY HIGH SPDS SCHEDULED FOR MONTH (RESERVE PLT). SHOULD HAVE TAXIED VIA TXWY T TO RWY 27L. COMPANY NOW BEGINNING TO BUILD LARGE QUANTITY OF CONTINUOUS/MULTIPLE DAY TRIPS -- SOME EVEN WITH REDUCED REST PERIODS. THE FAA SHOULD STOP THIS -- NOW!!