Moved to the night nappy section.
Have a read of the rest of the section as this question has been asked a lot before. You'll find lots of information there. We use Puddlekins Silent Nights, Hollow Oak night nappies and Holdens Landing Bedbugs. However some people with heavy wetters don't get on with Holdens Landings. Ems at Puddlekins can customise the absorbency of the night nappy for you so I would get some of those.
With regards to fleece, you don't lanolise it. Just wash after every use. Wool however does need lanolising and handwashing but is very easy to care for as it doesn't need washing after every use and only needs lanolising occasionally. Wool really helps to keep the nappy drier as it allows some of the liquid to evaporate. Have a read of the stickies in the pure wool section for more info about wool use and care.