I use Tots Bots Bamboozles, boosted with a microfibre&fleece booster that I made, as well as a fleece liner (in case she poops!), ALL wrapped up snug in a Bambino Mio wrap (usually the next size up thanks to the huge bum. )
That seems to last her Aaaaaaaaages, and by that I mean she is 7mths old, nurses (bf) at LEAST every 2 hours and wets loaaaaaaads. She can have it on at 6pm and it's still going at 7:30am the next morning. It'll be quite quite wet though, but the fleece liner keeps it all away from her so no rash.
I also have a LLSNN boosted to all hell and I put a fleece shortie over it.
I also have a few WNNNs that I'm trying to fit onto her teeny bottom but they're a bit big for her yet, lol, so they'll do when she grows a bit!
Good luck with your night time stash. (I still keep a few sposies about just in case )