COMMUTER FO AND CAPT REFUSED TO CONTINUE 'TRIP PAIRING' AFTER ARR AT HOME BASE.

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ON 11/91; I RPTED TO WORK FOR MY ASSIGNED TRIP PAIRING. ACCORDING TO MY BID PACKET THIS TRIP WAS SCHEDULED AS A NORMAL REST OVERNIGHT; ALLOWING FOR 9 HRS AND 51 MINS LAYOVER TIME IN MONTEREY. UNBEKNOWNST TO MY CAPT AND ME; THIS TRIP HAD BEEN AMONGST THE REVISED TRIP PAIRINGS; CHANGED AT THE LAST MIN; BUT NOT LIMITED TO JUST A FLT CANCELLATION. THE NEW TRIP PAIRING HAD INCREASED MY ON DUTY TIME AND SIGNIFICANTLY SHORTENED MY BLOCK-IN/BLOCK- OUT TIME DOWN TO 8 HRS AND 10 MINS. SUCH A SHORTENED TIME ALLOTTED; MAKES IT PHYSICALLY AND PSYCHOLOGICALLY IMPOSSIBLE TO OBTAIN ADEQUATE AMOUNTS OF SLEEP...AS REFED IN MY PREVIOUSLY SUBMITTED INCIDENT RPT DATED 11/91; THE FAA STATES CLRLY; 'AS A PLT; YOU SHOULD GET APPROX 8 HRS OF SLEEP A NIGHT.' ON THIS PARTICULAR OVERNIGHT; I RECEIVED ABOUT 4 1/2 HRS OF SLEEP. 'SLEEP RESEARCHERS CLASSIFY SHORT SLEEP AS FEWER THAN 6 HRS...' #1. THE NEXT DAY; WE WERE EXPECTED TO CONTINUE TO FLY FOR OVER 8 HRS ON VERY LITTLE SLEEP. BOTH MY CAPT AND I AGREED WE WERE NO LONGER SAFE IN THE COCKPIT; THUS; IN VIOLATION OF OUR MEDICAL CERTIFICATES; THEREFORE ILLEGAL UNDER FEDERAL LAW TO CONTINUE FLYING. UPON REACHING SAN JOSE; MY CAPT ADVISED CREW SCHEDULING OF OUR STATUS. WE BOTH TOOK OURSELVES OFF LINE.