B737 FO FACING PENDING FURLOUGH AND PERSONAL ISSUES REQUESTS TO BE RELEASED DUE TO FATIGUE.

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I NOTIFIED THE CREW DESK OF MY DESIRE TO BE RELEASED DUE TO FATIGUE; AND WAS GRANTED THIS REQUEST WITHOUT BEING ASKED TO SPEAK TO MGMNT. MY FATIGUE WAS PRIMARILY ATTRIBUTABLE TO LACK OF SUFFICIENT SLEEP IN THE DAYS LEADING UP TO THE CURRENT TRIP. THE STRESS INDUCED SLEEP DEPRIVATION WAS DUE TO CONCERN OVER MY IMPENDING FURLOUGH AND THE BEGINNING OF CHEMOTHERAPY OF AN IMMEDIATE FAMILY MEMBER. I BELIEVE THE SECONDARY CAUSE IS DUE TO THE RELENTLESS SCHEDULING OF MAX DUTY FOR B737 FO'S. FOR EXAMPLE; I WAS EXTENDED TWICE IN 6 DUTY DAYS OVER THE LAST WK CULMINATING BEING ON DUTY INTO A 7TH DAY ARRIVING AT MY HOME DOMICILE AT XA00 ON A SCHEDULED DAY OFF. THE CREW DESK STAFF ROUTING SCHEDULES PLTS FOR DUTY PERIODS WITH NO ROOM TO ABSORB IRREGULAR OPS FORCING THESE TYPE OF GROSS DEVS AND CONSTANT INTERRUPTIONS TO REGULAR SLEEPING HABITS. SUBSEQUENTLY; THE CREW DESK ASSIGNED ME ADDITIONAL DUTY ON THE DAY FOLLOWING THIS FATIGUE CALL 2 HRS AFTER ARRIVING AT THE GATE IN DOMICILE DUE TO LACK OF AVAILABLE RESERVES ON THE FOLLOWING DAY.