Well, if you have only had him for 3 nights I wouldn't expect much improvement very fast. It's going to take a bit longer than that.
Water breaks at night are not really needed. You can take up his water for the night before bed time. He will be fine.
Is he 8 weeks old? I'm assuming he is. He should have to potty about every 2 hours if that is how old he is.
Thor (Born 11/01/13)