what you should do is get a light box and start using it for 30 minutes at like 11, then after a week, roll it back to 1030 then 10 then 930 and keep going and you'll start getting tired earlier and earlier, so 3/4, 2:30, 2, 1:30, etc.

i just went to a sleep doc w/ the exact same schedule as you and that fixed it completely, now i just need to make sure to use the light box at least every other day when i get up