I dont wind Boy in the night anymore, he's 18 weeks old, he copes just fine. He has a nappy at 6.30pm and as long as I change him by 6.30am next morning theres no problem. He never poos in the night luckily for me. If I leave it longer than 12 hours though the nappy gives up and he ends up with wet clothes and bag.
DS is eleven weeks - he has his bath at 6.30pm, so fresh nappy on after that, and then that's it til morning (he wakes at 7.30). Occasionally if he's still wide awake at 10pm I'll change it again. I find he pees a lot more when he's awake, and if he goes to sleep soon after his last feed his nappy is full by the morning, but often not as heavy as you might expect.