some people get lucky with placements and get some sort of flexibility, but if there's a lot of students on a placement in relation to mentors you work the rota you're given. Some manage to squeeze through the 3 years with few or even no nights, others have to work nights if they ever wanna see their mentor for dust to get stuff signed off.
Its difficult to have any second job other than bank/agency HCAing because you don't even know what your next placement will be half the time till just before. And bank/agency HCAing is earlies (7ish to lunch time) or lates (lunch time till 8/9/10ish) or long days (both) or nights.
Even the shift work nurseries attatched to hospitals don't accomodate a lot of hospital shifts (and really you wouldn't want them to, too early/late for littlies)
Its not the most supportive, sisterhoodish environment, if you need time off for something to do with kids the normal reaction is tutting and lots of "well we all have kids.."
you have to make up time if you're off sick etc, you can't just write it off like at work.
So all in all, of course it's doable, lots of people do it with kids, but how much support do you have in the form of informal childcare if you are doing unsociable hours, how flexible can you REALLY be?
(academically it's not hard, its the politics and flexibility/hours which makes it a very difficult course)