We use the BabyBeehinds bamboo cloth nappies at night & they are great. (You can add additional bamboo boosters & use a wool cover for a great night nappy - DS is quite a heavy wetter & we have no troubles with him wearing it 7:30pm - 6am-ish).

But, if you want to use disposables, I wonder if you could use a cloth booster inside? (eg. insert a bamboo booster into the disposable nappy)?? Just a thought.

Might be worth having a look in the nappy forum & asking the advice from the nappy gurus!!