CRJ200 FLT CREW MISSED A CROSSING RESTRICTION ISSUED FOR THE DESCENT. BOTH PLTS WERE READING PRIOR TO THE DEVIATION.

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WHILE WE WERE LEVEL AT FL300; WE WERE GIVEN CLRNC TO CROSS INTXN AT FL200. THE CAPT WAS THE PF; AND HE NEGLECTED TO DSND TO MAKE THE XING RESTR. AT 10 DME PRIOR TO INTXN; CTR QUERIED OUR LAST CLRNC. I RESPONDED 'DSNDING TO FL200.' AT THIS POINT; THE CAPT BEGAN A RAPID DSCNT (5500 FT FPM) TO CROSS INTXN. WE CROSSED INTXN AT ABOUT FL240; AND WERE LEVEL AT FL200 5 MI PAST INTXN. WE WERE BOTH READING; AND I HAD ALREADY BEEN ON DUTY FOR 12 HRS. OUR CARRIER IS EXTREMELY SHORT-STAFFED ON PLTS; AND WE ARE CONTINUOUSLY FORCED INTO OVERTIME. ALTHOUGH THAT WAS NOT THE SITUATION FOR EITHER OF US IN THIS INCIDENT; THE GROWING 'FORCED FLYING' IS TAKING ITS TOLL CUMULATIVELY. NEARLY EVERY TIME I FINISH A TRIP; I AM GIVEN AN IMMEDIATE MULTIPLE-DAY TRIP THAT BEGINS WHEN I WAS SUPPOSED TO DUTY OFF. A WK PRIOR TO THIS INCIDENT; I HAD BEEN FORCED TO FLY 17 HRS IN ADDITION TO MY REGULAR SCHEDULE IN A 10-DAY PERIOD. THAT FLYING ADDS MANY HRS AT WORK AND AWAY FROM HOME THAT IS NOT EXPECTED. IT IS NOT UNUSUAL FOR US TO GO 10-20 DAYS WITHOUT A DAY OFF (COMPANY USES 24 HRS OFF IN 7; NOT 1 CALENDAR DAY). OUR VACATIONS HAVE NOW BEEN CANCELED FOR 6 MONTHS AND ARE CONTINUING TO BE CANCELED. WE NO LONGER HAVE MUCH QUALITY OF LIFE; AND IT IS MAKING ME INVOLUNTARILY APATHETIC TOWARD MY JOB. I; LIKE MANY PLTS AT MY CARRIER; NEED A BREAK AND ARE SIMPLY BURNED OUT. I ADMIT THE READING WAS A BAD IDEA ALSO. WHEN I HAVE AN EXPERIENCED CAPT; AND HE IS FLYING; I TEND TO PAY LESS ATTN THAN I SHOULD WHEN WE ARE NOT IN THE TERMINAL AREA.