9yo dd is sometimes wetting the bed. She took a long time to be dry at night - about aged 6, and is usually ok - she can go two or three weeks at a time without an accident and then we will have two or three in a week. She sometimes wakes up to tell us it has happened and sometimes has no recollection of it until morning. Given there are periods of several weeks without a problem I am assuming it is unlikely to be medical - any ideas or thoughts please?