I have very bad sleeping problems, once I go off my sleeping schedule it becomes all messed up.
If that happens you should do a "reset". Do this by simply staying up all day and all night. By the end of the day you will find yourself tired and ready to fall asleep. It may take a few attempts before you're able to do it, drinking coffee will aid you in staying up.
I fall asleep around 6PM, and wake up at about 3AM and I'm up for the rest of the day. I never knew how much I missed in the early mornings around here until i did this.

But if you like to party and all a lot then this sleep schedule is not really much for you since parties tend to be late.
You could also try a sleep aid such as Unisom, I used to take the sleep melts. They would put me out all night. It's not good to use them long-term though. You can get two packs on Amazon for $11. It's a few dollars cheaper than what you would pay at a retail store for two boxes.