Not for everyone but if you like routine (I do) then try Gina Ford. She sorted the early sleeping pattern for us. You do have to give yourself up to it for a few weeks and it does seem very strict at first glance but it worked for us. Good luck!
I don’t know why this thread has been resurrected and highlighted in today’s email - the original post was four years ago! Let’s hope she’s managed to solve the problem by now