I was always a light sleeper and NOT a napper by any means. I had a really hard time napping during the day when the babies arrived - I would only do it when I reached the point of being so exhausted I was nauseous. You're not alone! I don't nap at all now but their night time routine is a lot easier. They go down around 9pm and usually wake up twice during the night to nurse (sometimes I'll get lucky and it's only once). They're pretty quick and we're usually done and back to bed within 30 minutes.
I think I read in one of your other posts that you were BF them. Do you tandem nurse or at least make sure if one of them wakes at night, that you're waking and feeding the other one too? DS is my "squeaky wheel" and is always the first to wake but I always wake his sister (much as I hate to do that) and feed her then as well to avoid having her wake 30 minutes after I put him back down and go to sleep.
Hang in there!