ahh Leash , the night times can be really rough especially if you have had a bad day. B/F seems to be my partners excuse for not getting up, like you said all they can really do is change the nappy & settle them back to sleep after we have fed them, but even that would be nice once in a while. My partner has never got up in the night, he stopped changing nappies a few days after getting home, except for the occasional one after I have b1tched at him about it, & won't take ds if he is gizzling, apparently that is all my job. His saving grace is he will occasionaly on the weekend take ds after I have fed him & look after him until the next feed so I can continue sleeping, maybe this is something shell can do for you on a regular basis too & maybe one night a week so you can sleep.
HTH