B737-300 FLT CREW RECOGNIZED THAT THEY WERE FATIGUED AND NOTIFIED THE AIRLINE THAT THEY WERE UNABLE TO CONTINUE AS SCHEDULED.

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OUR FLT SCHEDULE WAS: DAY 1 SCHEDULED DUTY 9 HRS 56 MINS. ACTUAL DUTY 10 HRS 6 MINS. DAY 2 SCHEDULED DUTY 5 HRS 48 MINS. ACTUAL DUTY 4 HRS 50 MINS. DAY 3 SCHEDULED DUTY 5 HRS 5 MINS. ACTUAL DUTY 11 HRS 3 MINS. DAY 4 SCHEDULED DUTY 9 HRS 23 MINS. CALLED IN FATIGUED AFTER 3 HRS 26 MINS. I CALLED IN FATIGUED AFTER FLYING TO ZZZ. THIS SCHEDULE ENTAILED LONG DUTY DAYS FOLLOWED BY MINIMUM REST. INABILITY TO OBTAIN ADEQUATE SLEEP DUE TO SWITCHING BTWN EVENING AND MORNING SHIFTS UNEXPECTEDLY; INABILITY TO CTL HOTEL ROOM TEMPS AND OUTSIDE NOISE. REASSIGNMENT RESULTING IN A LEGAL LAYOVER ONLY ON PAPER THAT HAD NO ABILITY TO ACTUALLY RECEIVE ANY LAYOVER BEYOND MINIMUM REST AT THE HOTEL. THESE THINGS LEAD TO PLT FATIGUE AND NEED TO BE ADDRESSED BY OUR AIRLINE AND INDUSTRY WIDE. MONTH AFTER MONTH OF MINIMAL DAYS OFF; MAX FLYING DAYS AND 90 HRS PLUS SHOVED INTO A SCHEDULE IS HAVING AN ADVERSE EFFECT ON THIS PLT GROUP. WE ARE AN ACCIDENT WAITING TO HAPPEN AND IT WILL BE BLAMED ON PLT FATIGUE. I WAS FORTUNATE TO BE FLYING WITH A VERY OBSERVANT CAPT AND WE NOTICED THE SYMPTOMS OF ACUTE FATIGUE IN EACH OTHER AND PROMPTLY REMOVED OURSELVES FROM FLT DUTIES FOR THE REMAINDER OF OUR TRIP BY NOTIFYING CREW SCHEDULING WE WERE TOO FATIGUED TO CONTINUE FLYING.