OK, so it's a loooong time since my children were in nappies... and I promise I'm not a poo troll.
The current Pampers advert seems to indicate that if your child does a massive shit in the night then their nappies will guarantee no leakage until morning. The parents who hear the "noises" over the baby monitor on the advert sigh contentedly and go back to sleep safe in the knowledge that nothing will escape.
I am definitely on the slatternly side of acceptable MN hygiene but surely you would get up and change the nappy anyway?