We love our Sugarpeas fleece cover (I think both Diaperware and Soft Cloth Bunz have some) at night. I can use the single layer on ds, but they also make a two-layer fleece cover. It is super soft and holds it all in.
I actually right now prefer it over the wool simply because he tends to poop first thing in the morning before I have a chance to change him from his night time dipe, and with the fleece I can just throw it in the diaper pail with the dipe.
Our favorite nighttime solution so far (we've only been at this a little more than a week) is a Kissaluv countour under a Fuzzi Bunz (stuffed with a microfiber insert). The contour isn't enough by itself to hold up overnight, but I don't like to have to poly fleece right next to her and this combo seems really comfy - no leaks either