Bros, how can I get my sleep schedule back on track?

Recently, I've been going to sleep around 3-4 AM and waking up at 1-2 PM. Yesterday, I slept through my classes, didn't miss anything important, thank god. It wasn't always this way, before I was in bed at 10 and up at 8, and I felt great. But, stress, moving, school, and other things kicked in all at once. My schedule was royally screwed up. I tried going to bed earlier, but I just lay there for hours before falling asleep at the same extremely late time as usual. I can drift off and get close, but I can't fall asleep. Please, bros, what can I do?