My DD who was born almost the same time as yours 28/9/07 is still in pull-ups at night. She wants to ditch it but i wont let her as she wets the bed almost every night so i figure she's not ready. We talk about it a lot, how big girls don't wear nappies to bed, how she can call out for me to help her go to the toilet if she needs to at night etc. She gets it but just isn't ready. TBH the majority of kids her age i know are still in nappies at night. So i'm not too worried about it although it is annoying i agree!