AN A319 CAPT DESCRIBES PERVASIVE FATIGUE DUE TO HIS ACR WORK RULES.

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WE FLEW TO MEXICO CITY. I WAS VERY TIRED. WE FLEW AN APCH NAV APCH. I WAS THE PNF. I HAD GOTTEN THE ATIS ON COM #2 AND NEVER SWITCHED MY XMIT SELECTOR BACK TO COM #1. APCH TOLD US TO CONTACT TWR; WE WERE VERY BUSY WITH CDAP TO 200 FT ABOVE MINIMUMS ON THE VOR-DME 2 RWY 5L. I GOT CLRNC TO LAND AT 800 FT. I WAS SO TIRED THAT I AM NOT EVEN SURE IF I WOULD HAVE REALIZED THAT WE WERE ALMOST AT DECISION ALT FOR THE APCH. THE TRIPS THAT WE ARE NOW FLYING HAVE MY BODY SLEEP CYCLE SO SCREWED UP AT HOME; I ALMOST FEEL LIKE I AM IN A FOG AT HOME FOR THE FIRST DAYS AFTER A TRIP. I DON'T FEEL THAT THERE IS SUFFICIENT TIME TO GET REST. WE LANDED SAFELY BUT I AM NOTICING MISTAKES THAT I AM MAKING NOW THAT I HAVE NEVER MADE IN ALL MY PREVIOUS FLYING HERE AT ACR OR BEFORE. MY FO'S ARE ALSO MAKING VERY SIMPLE SMALL MISTAKES; LUCKILY WE ARE NOT MAKING THE MISTAKES AT THE SAME TIME. FATIGUE! AS MY FATHER HAS TOLD ME SINCE I STARTED FLYING AND STILL DOES TODAY AS A RETIREE; NOTHING HAPPENS UNTIL THE BODY COUNT GOES UP. WE CANNOT LET FATIGUED PLTS LET SIMPLE MISTAKES SNOWBALL INTO A CRASH! I HAVE NEVER BEEN SO TIRED EVEN ON MY DAYS OFF; WE HAVE GOT TO THINK OF SAFETY HERE.