I've been wondering this too - but DD has been in cloth full time since she was 3 weeks old so I can't really compare. She slept through from 11 weeks old, although recently (from about 5.5mths onwards) she has woken once or twice most nights, sometimes for a feed, sometimes a cuddle, sometimes just to be rolled on her side, sometimes for a poo!
The only thing that I wonder about with cloth is whether it's harder for her to move around and get comfy, as it does sometimes seem that she cries, and all I have to do is roll her onto her side and she stops and is asleep again straight away.
We have various different night nappies and I've not noticed a particular difference between them so I'm not convinced there is a link, not for us anyway.
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