We've been having major sleeping issues, and it took a bit of work but we are back on track. They key for us was to do a consistent bedtime routine - so bath, story, bottle, then in the cot by 7pm awake. We then pat the mattress and have some music playing, also she has a gloworm toy that plays a lullaby when you press it, so we use that if she is getting upset. The first time we did it, it took 40 minutes for her to go to sleep and she cried for most of that - it was hard not to pick her up, but I knew that it was something we had to do. THat was for a morning nap (we obviously don't do the same bedtime routine) but by bedtime that night, it took 10 mins and she was even giggling with DH one minute and then asleep the next. And since then, its going well. BUt you have to make that conscious effort to change things in order to break the habits (our habit was feeding and rocking to sleep).

hth