B737 CAPT LINES UP WITH THE WRONG RWY DURING A VISUAL APCH AND DSNDED BELOW NOISE ABATEMENT PROCS FOR THE ASSIGNED RWY.

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LAST LEG OF DAY -- LONG DAY THAT BEGAN AT EARLY MORNING; FLYING INTO CYYZ AT NIGHT FOR WHAT ATIS ADVERTISED AS ILS RWY 6 APCH. MIND SET FOR THAT. DOWNWIND; APCH ASKED IF WE HAD THE FIELD IN SIGHT. WE REPLIED IN THE AFFIRMATIVE AS HE GAVE US A BASE LEG VECTOR. HE CLRED US FOR THE VISUAL TO RWY 5. I STILL HAD IN MY MIND THAT WE WERE GOING TO RWY 6; AND THAT RWY WAS CLRLY VISIBLE; VERY WELL ILLUMINATED; AND PHYSICALLY CLOSEST. THE CTLR CALLED AND SAID IT LOOKED LIKE WE WERE LINING UP FOR RWY 6 (WE WERE) BUT REMINDED US WE WERE CLRED FOR A VISUAL APCH TO RWY 5. ALT WAS APPROX 2500-2600 FT. HE THEN STATED THAT WE WERE BELOW THE 3000 FT ALT RESTR FOR NOISE ABATEMENT ON RWY 5. SINCE WE WERE SET UP FOR RWY 6; WE WERE NOT AWARE OF THE APCH PLATE FOR VISUAL APCHS TO RWY 5. (FATIGUE DEFINITELY A FACTOR IN THIS WHOLE EVENT.) LEVELED OFF AND LINED UP TO RWY 5 FOR UNEVENTFUL LNDG. RWY 5 APCH LIGHTING VASTLY INFERIOR TO RWY 6; MAKING IT EFFECTIVELY INVISIBLE ON BASE LEG; ESPECIALLY WITH THE MINDSET LEANING TO RWY 6. WE HAD BRIEFED RWY 6 (IN ACCORDANCE WITH ATIS) BUT SHOULD HAVE BEEN PREPARED FOR EITHER RWY. COULD ALSO BRIEF FATIGUE LEVEL TO ENHANCE AWARENESS BTWN CREW MEMBERS.