I would attribute this to general mental and physical stress caused by college. Believe me, my girlfriend's sleep cycle is even more fucked up than yours. It's not even a cycle, it's more like a serrated edge.

I would say find a night when you can just settle down, take some sleeping pills at 8 pm, (you can get generic sleeping pills anywhere, but I think you have to be 18 to buy them) and pass out at 9. Sleep until whenever you need to get up, and you should be able to fall into your regular schedule again the next night.