You need an actual "Night Nappy" sweets, an itti wont last all night, just a few hours.

Good ones can be hard to come by, but the Pop In is an easy one to get, and works great with the night booster added.

I use Sandmans and Fluffy Bubs, and love them both for night time.

There are some threads here I'm sure on night nappies....

eta... Am I allowed to tell you Mel sells Pop In nappies???