S.B.
I pulled the pullups when she'd gone a week without peeing in them and we've only had a few accidenst since then. I had nighttime accidents myself until I was almost a teenager, I just slept too hard to wake up. Sometimes, and I'm 32, I still will wake up and catch myself just before I have an accident. I didn't want to assume my daughter would be the same way, but I didn't want to punish her for accidents either. (Thank the Lord she hasn't had the same problems as me!) She was probably just about 4 when we took away the pullups at night.
One trick I've learned and has come in handy the few times we've had a problem was putting a waterproof sheet, then a regular sheet, then a waterproof sheet, then a regular sheet on her bed. Then if she has an accident, pull off the top set and you don't have to completely remake the bed in the middle of the night.