I sleep well because:

• I drink beer :)  (yeah, it really works for me. One beer and I sleep like child)
  
• I listen to your favourite music (not too loud, but not too quiet (it would make you focus on it))
• I drink warm milk with honey (used to do it when I was young)
• I eat something sweet (not very often, not at all, but it helps too)

These work (or worked) for me. I'm sure it's nothing new or special but reacting to request.

Last thing. Please don't try to mix beer wih milk and honey and chocolate. You would probably throw up ;)

Good luck, good sleep.