I would also recommend wool over a night nappy. It is breathable so allows excess moisture to evaporate and is less sweaty for baby. You'll find some lovely preloved soakers in classified. Wool sounds very complicated but it is really easy to use. Have a look in the pure wool section of the forum for info
I found a great knitting pattern on this forum for wool soakers, so I have another knitting project to complete! Should be cheaper than paying for the wraps from WN as they are 9 pounds and are fleece not wool. Off I go to the wool shop tomorrow!