Fixing my schedule

Im kinda screwed. after working at amazon during peak season my shifts went untill 4:30 AM and ruining my sleep schedule but now its gotten significantly worse. It is currently 10 AM and i havent slept yet (i woke up at 3 pm). problem is school starts next week. would it be best to try and sleep early everyday to try and fix it so i can wake up at a reasonable hour or do i do the opposite and embrase it staying up later and later untill it goes back to normal?