DESTABILIZED APCH INTO BWI DURING THE DAWN HRS.

Narrative

WE WERE CLRED FOR AN ILS TO RWY 10 BWI. WX RPTED 400 FT; 1 1/2 MI; BUT CLOSER TO 500 FT AGL CEILING. THIS WAS ESSENTIALLY A STRAIGHT-IN APCH FROM APPROX 45 MI. FO WAS FLYING THE APCH. IT WAS MY FIRST LEG WITH THIS FO AS THE PF. HE WAS HIGH AT THE OM BY APPROX 350 FT. HE WAS HAVING TROUBLE GETTING STABILIZED BUT FELT HE COULD GET THE APCH STABILIZED BY THE APCH GATE (COMPANY; 500 FT AGL). WE WERE CONTINUOUSLY ACROSS THE LOC; UP AND DOWN ON THE GS. AT THE 500 FT GATE WE WERE APPROX 1/2 DOT LOW ON GS AND 1 1/2 DOTS R ON LOC. AS I WAS TO BEGIN THE COMMAND FOR GAR; WE BROKE OUT; MADE A L CORRECTION AND LANDED NORMALLY. WHILE THIS APCH WAS NOT COMPLETELY UNSAFE; IT WAS OUTSIDE COMPANY AND MY PERSONAL STANDARDS. IN RETROSPECT; I SHOULD HAVE TAKEN THE ACFT AND COMMENCED THE GAR. FATIGUE AND NOT WANTING TO GAR WERE THE PRIMARY CAUSES OF THIS DEV. IT IS MY EXPERIENCE OVER THE LAST 35 YRS THAT FLTS DEPARTING BEFORE SUNRISE AND ARRIVING AFTER SUNRISE; REGARDLESS OF REST; ARE THE MOST UNSAFE FLTS; ESPECIALLY WHEN IFR APCHS ARE INVOLVED. I HAVE SINCE MADE A MENTAL NOTE TO MAKE THE 500 FT GATE AS BIG A PART OF MY APCHS AS ARE THE IFR MINIMUMS.