JenAt - ds mostly only does 3-4 hours at night, so you're not alone! Luckily he goes down early in the evening so at least I get some me time. I'm hoping his sleep improves when he goes into his room because I have started to hit the wall - just in time for the school holidays and the end of pre school (oh crap)
Ds has also turned into a shouty, 'no', 'why?', 'in a minute' monster. He is mostly lovely but he has certainly become more volatile with his behaviour. Before he was so easy to predict, but now he kicks off at the most unexpected things. This too shall pass ..........
Wrt to your babies and dh, I would agree with what Frakk said. Men do find it hard to interact with small babies, but that's no excuse. Whenever dp is at home, give them the baby once it has had a feed. This is the time they are at their most content, so pass them over and get your dp spending time with them. The lo's enjoy just being walked around and talked to. Walking around the garden and talking about the plants and animals is a good one because you can just waffle away and you don't need a two way conversation to keep the talking going!
I'd also say if you plan to go out and leave baby with your dp, maybe dp doing a feed becomes a regular thing, rather than just doing it when you go out.
Or,do nothing! Once your lo isn't so dependant on you for feeds, your dp can get even more involved. I must admit, as much as I am a champion for breastfeeding, I bloody love it when they start eating. For me it's a relief that I am no longer the sole source of nourishment and breastfeeding becomes much more of a joy as it's an excuse for a lovely long milky cuddle, because from around 6 months they seem to start moving and not wanting to be held quite so much. There is more to the world than mum and a boob!