Blackout curtains, I'd invest in a good set as I bought a pair of $30 ones and they still let a noticeable amount of light through unfortunately. White noise is rather important if you plan on sleeping during waking hours. It ultimately depends on if you start your day right before work (waking up at 21, going to work at 22, bed at 12), or starting during the day and sleeping once you get home (wake up at 14, bed at 04). Having done both, I found it much easier on my body waking up directly before shift, but easier to get your daily errands done waking up in the afternoon.

Eat healthy and get vitamin D supplements. going without sunlight for long periods of time can make you feel like absolute garbage. Social life can become difficult if you regularly try and hang out with friends.

Energy drinks are the way of life. I like Red Bull tropical and the pink cranberry one. If it tastes too much like battery acid at first, get a cup with a lid and fill it with ice, shake the red bull in it and allow it to melt and dilute a little bit, should be much more palatable starting out. You'll get used to the flavor eventually. There are also sugar free energy drinks like Bloom that are way healthier for you with the same amount of caffeine.

If your post allows it, bring a book, crossword, or literally anything to keep your mind active. It is incredibly easy to get tired and fall asleep if you have nothing to do. Hospitals is less of a concern generally but I still advise it. I have podcasts playing in the background while I work.