Both of my children were the same and my youngest who is 9 has only just stopped doing it i found out why its because they feel more secure in nappies than they do using the toilet both of my children still wesr pampers size 6 a night due to the fact that none of them has had a dry night in 15 weeks they ask me to put their nappies on at night as they tell me they would rather wake up in a wet nappy than in a cold wet bed. Ihope thi information is useful to you thanks for reading it.