I wish I had advice - I have been a terrible sleeper all my life, I take medication to sleep now and it isn't great. My daughter has never slept well. She still wakes up early, no matter what time she goes to bed. She has told me once 'I wish I could turn my brain off' which broke my heart, because I am the same way. Having a lot more years under my belt, I try and give her tips.. but we are just hyper-alert people and no matter what, exercise during the day (she gets A LOT), bedtime rituals, etc.. we just aren't sleepers.
It's hard..