When we had a week of dry nights, DD got new pjs
She was 4 and it was a very big deal to her, I wanted to get her something to show that we knew how much of a big deal it was to her too.
Twice in the night if she is still having a full bedtime drink seems fine to me. We lift DD at about 10.30 (she sleeps too soundly to wake herself, and was getting sore in nappies, hence the joy!), but we don't need to after that - if she has had a lot to drink with dinner though she will wake about 5.30, go to the toilet, and then be awake for the rest of the day