AaaronC,
I too have a night shift. I work approximately 3 pm to 5 am Mon thru Fri. That's a 14 hour day, five days in a row. The good news is that I almost never have insomnia anymore. It takes me only about 10 minutes to fall asleep every morning. I get better sleep if I get to be before the sun comes up (even though I have the room darkened with dark blinds, my body seems to know where the sun is anyway.)
I've had this schedule for 4 years now. At first I was a Zombie 24 hours a day, even on Saturday and Sunday. After about 9 months of being a Zombie, I started to feel sort of normal.
I could only sleep about 4 hours a day (wake up and not be able to get back to sleep, even in a quiet room) for the first 6 months, then went up to 5 hours a day in years 2 to 3, now am up to 6 hours a day sometimes.
I do not have a noisy neighbor like you do (Thank God !! ). But I do have trucks rumbling back and forth at the landscaping business next door.
Believe it or not, I have gotten used to them. They used to wake me up, but now almost never.
My cholesterol, lipids, and blood pressure are the same as before I started this insane schedule, but I must admit I look a lot older than 4 years of normal aging would account for.
I tried ear plugs, but got a red irritation in the canal from them.
Luckily I am able to take naps on my job if I get tired. I almost always take a 15 minute nap every day. Often two 15 minute naps.
To summarize, I think the night shift is bad for one's health, in a general way. It just wears you down more than a 9 to 5 job. But of course it's a trade-off. I'd rather have my night shift job than the day shift jobs I have checked out, all things considered.
Good luck with the bad neighbor. Maybe she will move out.