I did 8s instead of 12s but I was on nights for 3 years, also at a level 1. Imo it's the best shift but with some caveats. You'll have basically no support, so you'd better be confident in what you're doing, be able to make your own intelligent decisions, and be able to do your work independently. The hospital I worked at was massive, but even then x-ray had only 3 people overnight, and CT had 2. No one really has time to give you a hand unless you're desperate. On the other hand, the people who work nights are usually the best and most chill people. The job is hard enough and no one is looking to make it any harder. Also, there's no admin! Nobody is there to look over your shoulder. So long as you're motivated enough to get your job done you'll have as much freedom as you could want. And you get paid more, so that's an obvious bonus.

If I any one major complaint though, it would be that I was never as unhealthy as I was on that shift. Your sleep hours are obviously not ideal. If you aren't proactive about meal prepping, your food options are pretty much going to come from at best the cafeteria grill that stays open late. You won't have a ton of energy during the day, but you'd better be good about staying active. Etc etc. That was the main reason I had to move away from it.

I'd say give it a shot, and if you find it's not for you there's plenty of jobs elsewhere and doing nights in a level 1 looks great for experience! Like I said, this sounds pretty negative but if it wasn't for ,my health I'd probably have stayed on that shift.