go to sleep every day at the same time, but never try to go to sleep when your not tires, so read a book before bedtime or take a hot bath or something that gets you sleepy…
but if you still cant get to sleep, lay in bed and be very still and quiet to try to listen to the outside noises and such, it gets you to sleep FAST.

and wake up at the exact same time, my mom has been doing that for about a half a year because she had to work, but now she gets up at that time by herself, shes simply not tired.

follow those instructions and youll be on track in about 2-5 days

be self employed,
or medication might help

take a weekend and do not go to sleep. pass out on the couch when you have exhausted yourself. but, make sure that you do this so that you will fall asleep at the time you should be sleeping. you should get back to your normal 6 to 8 hours.

what ever your new work hours are start cleaning every thing in the house or do some yard work , walking or jogging if you work hard enough you will sleep, and get used to the new hours, sounds like you are lying around and worrying to much about it.

I have had a similar problem my whole life and the other day learned about Delayed Sleep Phase Syndrom. I do the same thing. Going to bed at midnight is like asking a normal person to go to bed at 5pm. and around 4 – 6 am is when I fall asleep. I am 34 now and I have just learned to deal with it.