DD has been out of nappies at night since about 3 3/4. She rarely gets up. I found milk before bed increased the night weeing. If she did get up, she used to come to my bed, tell me she needs to go to the toilet, I'd say "OK, go to the toilet", then she'd go and go back to bed. Around 5 she stopped coming in to tell me and just goes now. I have a nightlight in her room and the hallway that lights the toilet room.