So I had heaps of problems with my now 14month old and her sleeping. She was never good a sleeping as she was 11 weeks prem and from the very start was continuously waking through the night and only have cat naps during the day. It didnt improve as she got older and we tried everything possible, co-sleeping, crying it out, controlled crying, feeding and dummy.
One day after 2 weeks of no sleep at all, I went to the Dr's and they suggested a sleep centre in Brisbane. I must tell you it was a god sent. It only took my then 13month old 1 day to catch on and she now sleeps for 1hr in the morning, 2hrs after lunch and sleeps through the night 7pm to 5am.
What they do there is teach you how to identify what cries mean what, that whinging doesnt mean they are upset, i means they want attention and that continually going into your baby is actually keeping them awake. They dont condone controlled crying, they use a method called comfort settling.
It does take awhile to get in (2months) but it is totally worth the wait, and if you are totally committed to doing everything they teach you, your baby will be sleeping better much quicker. And having a sleeping baby means a happy baby.
I am happy to answer any questions etc that anyone may have.