B777 CAPT BECOMES ILL ENRTE; AND REMAINING CREW MEMBERS DIVERT.

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I WAS AWAKENED OUT OF MY SCHEDULED CREW REST IN THE BUNK ROOM BY THE FLT ATTENDANTS. THEY INFORMED ME THAT THE CAPT WAS 'PASSING OUT' AND VOMITING BLOOD THROUGH MOUTH AND NOSE. I RACED UP TO THE COCKPIT AND WITNESSED EXACTLY WHAT THEY RELAYED TO ME. THE FLYING FO INDICATED THE SAME AS THE FLT ATTENDANTS. HE STARTED TO DECLARE AN EMER WHILE FLYING THE AIRPLANE WITH AUTOPLT ON. I HELPED THE RN CERTIFIED FLT ATTENDANT WITH TAKING CAPT'S BLOOD PRESSURE -- 70 OVER 40. AFTERWARDS; I SPOKE TO CAPT; AND INFORMED HIM THAT WE WERE GOING TO MOVE HIM INTO THE CABIN. HE COMPLIED. HE WAS ABLE TO STAND UP WITH OUR HELP AND WALK BACK INTO THE CABIN. I THEN PREPARED THE CAPT'S SEAT FOR US TO SIT IN. I LAID PAPERS AND BLANKETS AND PLASTIC DOWN ON SEAT. AFTER THAT THE OTHER RELIEF PLT STEPPED UP TO ASSIST THE FLYING FO WITH PROCEEDING TO ZZZ FOR LNDG. I THEN CALLED DISPATCH AND SPOKE WITH THE DISPATCHER AND TOLD HIM WHAT HAD TRANSPIRED. I RELAYED AS MUCH INFO THAT I COULD THINK OF AND DISCUSSED THE FACT THAT WE DIDN'T HAVE A CAPT TO TAXI THE AIRPLANE TO THE GATE. I TOLD HIM THAT WE WERE APPROX 50-60 K LBS OVERWT FOR LNDG AND WHAT EFFECT THAT WOULD HAVE ON THE AIRPLANE. HE SAID IT WOULDN'T BE A PROB. WE THEN WERE CLRED DIRECT TO ZZZ AND CAME IN BELOW THE CLOUDS AND LANDED; TAXIED TO THE GATE WITHOUT INCIDENT. IT HAPPENED RATHER QUICK. I GUESS THAT FROM THE TIME THAT I WAS AWAKENED FROM A DEAD SLEEP TO THE TIME WE TAXIED IN WAS APPROX 50 MINS.