There are just bucketloads of books about getting toddlers to sleep "better".
I met a lady whose DD was something like 3yo and still waking up every 2hrs, and didn't sleep many hours total/night (was it 8?)... the lady said the sleep depriv. was grim but the alternatives weren't acceptable to her.
Do you know what? I admired her. I think controlled crying would be an "easier" option. She was doing what she felt was right for her child by not getting "tough". I can thnk of far, far, far worse things to be accused of wrt my kids than being "soft" on them.