Kaz, this might be making life harder but my girls like to listen to music while they are going to sleep so they have an ipod that DD1 can operate (DD2 is almost there) but a cd player could work just as well. They have a few fave albums they listen to at night. If they wake up during the night then I go in and tell them it is still night time (they are not allowed up until it is light) and put the music on, give a pat and a kiss and leave the room. If you think that associating music with sleep would work maybe that could be an option?