B737 FO IS CONCERNED ABOUT FATIGUE IN THE COCKPIT.

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I'VE BEEN MEANING TO WRITE FOR A WHILE BUT HAVEN'T BEEN ABLE TO DETERMINE THE PROPER FORMAT SINCE THIS RPT IS NOT FLT SPECIFIC. I HAVE NOTICED IN MYSELF AND AMONG THE CAPTS THAT I HAVE FLOWN WITH LATELY AN INCREASE IN PROCEDURAL MISTAKES THAT; WHEN ISOLATED; ARE RELATIVELY BENIGN. THESE MISTAKES INCLUDE MISSED RADIO CALLS (MORE THAN USUAL); ERRORS WHEN READING CHKLISTS; REACHING FOR THE WRONG CTL (EXAMPLE: FLAP HANDLE VERSUS GEAR HANDLE); MISSING ITEMS ON FLOWS; ETC. WHEN COMBINED; THESE MISTAKES LEAD TO OTHERS AND HAVE THE POTENTIAL TO LEAD TO DAMAGING AN ACFT OR A HULL LOSS. I BELIEVE THAT THE CAUSE OF THE ABOVE IS FATIGUE. IN MOST CASES; THE PLT HAS SLEPT WELL IN THE PRECEDING DAYS BUT HAS NOT HAD ENOUGH TIME OFF TO EFFECTIVELY DECOMPRESS. AS YOU KNOW; THERE ARE MANY STRESSORS OUT THERE RIGHT NOW. MANY TIMES; FATIGUE IS NOT RECOGNIZED BY THE INDIVIDUAL UNTIL IT IS TOO LATE (CRUISE OR APCH PHASE). UNLESS MORE DAYS OFF ARE BUILT INTO THE LINES; THIS PROB WILL CONTINUE. ACR X IS DESTINED FOR LIQUIDATION IF A HULL LOSS IS SUFFERED; ESPECIALLY IF PLT ERROR/FATIGUE IS CITED. IF WE WERE TRYING TO DETERMINE THE LIMIT IN SCHEDULING WORK RULES; WE HAVE FOUND IT. WE ARE FATIGUED. PLEASE HELP US. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE FO FLIES FOR A COMPANY THAT UNILATERALLY TOOK ALL PROTECTION OUT OF THE CONTRACT. THE RPTR SAID FLT CREWS HAVE TO WORK 4 OR 5 DAYS MORE A MONTH. THEY HAVE EXTENDED DUTY TIME. THE RPTR SAYS THERE ARE MANY MORE MISTAKES BEING MADE IN THE COCKPIT. HE SAYS FLT CREW CUMULATIVE FATIGUE IS IN EVIDENCE.