Assuming you've got a large size for your little chunk if you're looking at PUL wraps, a large Mother Ease Airflow fits these nappies with room to spare and allows for some air circulation, which can help with the general stinkiness/wetness of a night nappy. We used to use these all the time... however, I've since been converted to wool and find this even better for night time use than the ME Airflow wraps
I actually mostly use fleece as it's like a 'lazy wool'- you don't have to soak it in a lanolin solution. You just put it over the nappy and wash it in the morning on a fairly low temperature of 40 degrees. Wool isn't that much more effort, you don't need to wash it after every use, you hang it out to air in the morning. If you go to the following link it explains in more detail about wool. http://www.woollywraps.com/store/WsAncillary.asp?ID=3
I tried fleece too, but found that Erin tended to get pressure wicking with it, as she's flat out on her back ALL night (Even with extra booting at the back of the nappy ) Wool seems able to cope with this much better Erin is a pretty heavy wetter though, so this probably didn't help on the fleece front either.