you could try the Rapid Return technique (a la House of Tiny Tearaways).
The first time they get up you say, "No it's bed time, get back into bed, night night" and walk them back to bed, tuck in, kiss, whatever.
second time, "it's bed time, night night" and walk back to bed.
third time, "no, it's bed time" walk back to bed, no discussion
4th time, walk them back to bed in silence. no discussion
and basically the idea is that you just keep walking them back to be in silence and eventually they get the idea that it's not worth getting up because nothing good happens, e.g. no conversations with mummy, no cuddles, no drinks etc
on the House of Tiny Tearways they showed families doing it and the first night could be really hard, with some kids getting up, say 30 times or whatever, but over the next couple of nights, if the parents were consistent the number of returns reduced very quickly.
Like CC (which we did btw) it's hard at first, but IMHO, I do think it's worth children how to self-settle, particularly when there's another baby on the way and you may not always be available for them to the extent that you have been.
good luck, I know it's really hard!