Just try to stay up as long as possible so you wake up a little later each day until your schedule is to your satisfaction. I like waking up at 2 or 3AM but after some weeks I always end up fucking up my schedule against
when your sleep schedule is so that you sleep in middle of day, what are you to do?
stay awake til night time? always fail
you can fix it quite fast if you are ready to do biphasic sleep for a while. you schedule 2-3 hours sleeping during the night together with 2-3 hours sleeping during to where your sleep schedule has moved. you start by shortening your sleep during fugged day time, then go get a nap during night. then you shift more and more of your sleep to the night over next couple days.
