My 4 year old daughter is not dry at night. She is reliably toilet trained in the day, can't remember the last accident. Has been since 2.5 years old. The problem is that she is a very deep sleeper and doesn't wake, not even if she's wet the bed (when we have tried without a pull up). Her pull ups aren't soaked, but they definitely aren't anywhere near dry. I know this isn't 'normal' but is it unusual?