Well, it could be the hormones, or the fact that I'm usually pretty snarky and intolerant of men having opinions about how pregnancy "should" be
.....but.....I would probably:
1) Completely ignore him when he makes comments about you being tired "all the time".
2) Tell him, "I'd like to see you nourish and grow 3 human beings and not be a little worn out." (I'm starting to get 'the tireds' the past few days, and I only have one in me!)
3) Remind him that just because a book says something, it doesn't mean it's true. And keep reminding him that, because you'll likely get some "advice" books (or magazines, etc.) with lousy parenting advice that isn't worth the paper it's printed on....
4) I'd be tempted to sleep even longer than I really wanted to. But that's just the beligerant part of me.
Seriously, though, I'd try to not let it get to me. Any woman he complains to is going to realize he's being silly, and any man who agrees with him also has no frame of reference to base his opinion on. I bet it is tough to feel like he thinks you're "milking it" and pushing the progress, though - sorry about that.
Maybe there is a multiples book out there that might have some useful information (even though I just bashed books above - ha!) That might actually explain the differences between multiple gestations and single gestations. I think if I had any book, if I were you, it would be a book like that. You could photocopy pertinent pages about the main differences and leave them out for him, if he doesn't have time to read a whole book. I don't think a Nova special on a single pregnancy would help, because the difference here is you have more than one baby so everything is bigger, earlier, and more than a single.
Again, I tend to be a little feisty when things like this happen, so you can take or leave my initial advice depending on how your DH would react. Maybe someone else will have some more gentle suggestions. You just keep sleeping as much as your body needs to, and grow those babies!!!