I wouldn't recommend cushie tushies for night time either. My DS is only 5 months and still has night feeds, so I change him during the night (at least once).Our best option with him is a Green Kids Anytimes with hemp insert and hemp booster. But that doesn't last the whole night.
GK anytimes with a bamboo insert, bamboo booster and microfibre insert are fantastic, and keep DD1's tooshie dry for about 9 hours. This way, I don't have to change her nappy during the night even though she still wakes for feeds. The only thing I would say is that GK's are quite wide in the crotch...