I have not't tried night time potting training yet, but will start in December when she'll be around 31 months. She is trained quite well in the daytime.
I know the "theory" in night potty training is:
- Get her to pass urine before bedtime
- Restrict the amount of fluids she takes in the evening
What time does she usually sleep? After the bed wetting does she request for more fluids/milk?
How about waking her up before you and hubby go to bed to pass urine (if you sleep much later than her).