The main goals is to realize when you want sleeping hours. When i worked 3rd shift we ended a lot of nights at the bars opening up at 6am (HELLO Wisconsin) and it was fun, but made for a rough first few hours at work the next day. I didnt enjoy the 3rd shift so much because i would oversleep, and it became 3-4 days a week i would pretty much only work, drink, then sleep and wake up just in time to start work again. That wasn't fun, but the pay was pretty dope.
Do what works best for you, a routine is the best idea IMO. If you need 2 hours to cool down, search for a movie to get after work at 6am that you want to watch. Hell, i used to get docs i KNEW i would fall asleep to on my xbox youtube and rock that out. You'll figure it out, just realize if you are oversleeping or even undersleeping, it needs to get fixed right away before it becomes a problem that lasts months instead of days/week.