B727 CREW HAD ALT OVERSHOOT DSNDING IN CZYZ CLASS E.

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CRUISING INTO TORONTO; WE WERE LEVEL AT FL290. WE WERE CLRED TO 11000 FT AND TOLD TO FOLLOW THE PROFILE DSCNT FOR RWYS 23 AND 24L. THE DSCNT PROFILE CALLS FOR US TO CROSS WATERLOO BTWN 17000 FT AND 13000 FT AND TO THEN CROSS GUELF AT 11000 FT. THE FO AND I DISCUSSED THE NEED TO CROSS WATERLOO AT ONE OF THE LOWER ALTS IN THE 4000 FT BLOCK IN ORDER TO BE ABLE TO REACH GUELF AT 11000 FT AND 250 KTS. SHORTLY THEREAFTER; THE FO STARTED HIS DSCNT. I HAD SET 11000 FT INTO THE ALT ALERT. DURING THE DSCNT WE BOTH FORGOT ABOUT THE RESTR AT WATERLOO AND AS WE WERE LEVELING AT 11000 FT; 15 DME PRIOR TO WATERLOO; I REALIZED OUR MISTAKE. NO TFC WAS NOTED ON THE TCASII. I ASKED THE CTLR IF THERE WAS A PROB WITH OUR DSCNT. HIS RESPONSE WAS 'NO PROB; YOU JUST GOT DOWN A LITTLE EARLY.' I ASKED IF THAT WOULD BE A PROB AND HE JUST SAID 'NO.' FACTORS AFFECTING OUR MISTAKE: 1) MY PREVIOUS TRIP WAS A 4-DAY TRIP THAT TURNED INTO A LONG 5-DAY TRIP. MY SHORT TIME OFF AT HOME DIDN'T ALLOW ME TIME TO FULLY RECOVER. I WAS TIRED BEFORE I STARTED THIS TRIP. 2) THE FO WAS JUST RETURNING FROM 25 DAYS OFF. 3) WE HAD A 3+ HR SIT IN CHICAGO. 4) I SHOULD HAVE SET 13000 FT IN THE ALT ALERT UNTIL WE CROSSED YWT.