yea the first thing thats going on is your clock is switching. the circadian rhythm is designed around 24 hours so it will take a few weeks for yours to switch to a later sleep time/awake hours. black out your room and turn down the temperature when trying to pass out.
another big thing is stimulants. you might not realize but the stimulants (coffee/tea/supps) that you drink during the day affect you later that night. if you down a coffee at work at 8PM, most likely you wont be able to go to sleep 4 hours later.
so work on the quality of sleep (dark room, cold) and avoid stimulants so you can work yourself into a steady schedule. you wanna go to sleep at the same exact time everyday, not 530am.
another thing to help sleep is ZMA. basic blend of zinc,magnesium, B6. I just started taking the brand they sell on this website, "ZMK", and bro I have never slept as deep. Crazy vivid dreams, testosterone is noticeably amped up, lots more energy than before. if you feel like your sleep sucks, this is definitely the thing to try.