A what point does a "night" nappy become important - as in how long do they sleep i one go where its important to have the extra absorbancy.

DS was not in cloth at night but hopefully this bub will be. I know they're all differernt but I can only go on my experience with DS - he slept for 5 hour stretches at night from day 4, and was a heavy wetter (would regularly split a huggies open)

Do I need to start with night time nappies from day dot or is it something thats more liekly to be necessary further down the track when bub is sleeping for longer stretches?