I've worked night shift for over 30 years.
I wanted to respond so that you wouldn't think any of us are ignoring your question.
The fact is that #1.I have no kids, #2.The yrs I have worked nites, I was all ready married.
As Diary said, It kind of depends how committed you are.
I have to say that in a way, relationships can be hard to keep up with this schedule.
My Husband has always tried to make it easier on me.
I have always felt that his support is what has made my job so much easier.
Is your friemd working 12 hr. shifts or 8 hr?
I work 8 hr---that means more shifts, but less hrs per day which leaves more time in any given day & it also means that when I get off work I am not as exhausted as I would be from 12 hrs, so that I can still do something.
My husband is retired at present which which makes life so much easier.
But before that, we still did OK.
As my husband has often said, he actually saw me more when I switched to nites then he did when I worked day shift. WHY??
He said this at a time when he was still working, by the way.
The reason --he aid-- is because when I worked days, all I did was sleep---------came home from work--laid on couch, went to sleep; made & ate dinner, did dishes together, laid on couch, went to sleep instead of watching TV with him; then, he'd wake me up & we'd go to bed.
Not much quality time together, there;
When I worked nites & he was working days---I'd go to bed when he left for work; I'd sleep well during the day, get up late, make dinner & we'd have the whole evening together before I went to work.
That worked really well for a number of years.
Now, he picks me up at 0730 & we have all day together we shop, go to the zoo, or beach or what ever. Then I go to bed between 3 and 4.
Like I say, we have no kids, so it is easier------HOWEVER--I still say it very doable if you want it.
Any specific questions, please PM me.