My sleep cycle is totally fucked up. How can I fix this?

Since becoming unemployed I have drifted into this totally messed up way of living. I fall asleep around 5am wake up at 10am, eat, go back to sleep till 3pm, then stay awake until I finally go back to sleep at 5am the next day.

I have removed the computer from my room and tried to force myself to go to sleep at a decent time but I end up awake in bed for hours with no luck.

WAT DO!?