FLC LEVELS AT THE WRONG ALT DUE TO A WRONG ALTIMETER SETTING.

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WE RPTED OUT OF 11000 FT FOR 15000 FT. AFTER WE LEVELED OFF AT 15000 FT CTR SAID 'SAY ALT.' FO 'LEVEL AT 15000 FT.' CTR 'CHK ALTIMETER SETTING;' AND GAVE US A DIFFERENT SETTING THAN WHAT WE HAD. I PUSHED THE XPONDER TEST TO SEE WHAT ALT THE CTLR WAS SEEING; IT READ 16000 FT. WE SET IN THE CORRECTED SETTING AND IMMEDIATELY CORRECTED THE ALT TO 15000 FT. I BELIEVE THE MAIN REASON FOR THIS INCIDENT WAS FATIGUE. CURRENTLY ACR FLIES CONTINUOUS DUTY OVERNIGHT XA00-XB00; THEN ON THE SAME LINE IN THE SAME MONTH YOU RPT AND FLY XC00 TO XD30 DAY TRIPS. YOUR BODY HAS NO TIME TO ADJUST; AND YOU END UP FLYING HALF ASLEEP; OR GETTING DISCIPLINARY ACTION IF YOU CALL IN FATIGUED. THERE SHOULD BE A LAW AGAINST A MIX OF ALL NIGHT TRIPS AND THEN ALL DAY TRIPS IN THE SAME LINE IN THE SAME MONTH IT IS NOT SAFE BECAUSE THE BODY HAS NO TIME TO ADJUST ITS SLEEP CYCLE. REST REGULATIONS THAT WOULD TAKE INTO CONSIDERATION HUMAN FACTORS SUCH AS CIRCADIAN RHYTHMS; AND SLEEP CYCLES WOULD BE A LOT SAFER FOR CREWS; PAX; AND WOULD LOWER THE STRESS LEVEL AT FAA ATC CTRS.