Hi, this thread took me back to my daughter's period of difficulty settling, at about 9 months. Unlike you kind souls, I did the hardcore controlled crying, but when I feel guilty about it now (poor little soul!) I remind myself that she had actually started sleeping through initially at 7 weeks, and by 3 months was settling in her cot at 7pm and sleeping till 5am.
So when she started keeping herself awake for several hours at bedtime when she reached 9 months old - I was stunned!! We had several weeks of her jumping about, rocking herself, even raising her legs in the air while lying down with eyes closed obviously exhausted, and then slamming her legs down onto the mattress to keep herself awake! My dh (now xh) was travelling about 50% of the time so I had little support. You see, I knew she could settle if she wanted to! Then she started waking and messing about in the night. So I bought the Richard Ferber book about controlled crying..
It took about 10 days in total and I found it an absolute nightmare. However, at the end of it, she was settling down and sleeping through again, and has slept fantastically ever since. I did extend the intervals of going in (5mn, 10mn, 15 etc) and I kept a note of how many times I went in and how long it took her to drop off. I started to plot it all on a graph (you can see how this took over my life..) and although the first night she screamed on and off for 2 hours, after a week, she was settling in 30mins with only a little bit of crying - this gave me the strength to carry on till she had re-learnt her old skill.
It was lucky I stuck at it, because I was pregnant again before she was 1 and had 2 under 2s to deal with, so her sleeping well was key. I still felt like a git though..