V.V.
Personally, I hate CIO. Is there a gentler method you could try?
It takes a little time, but the "No Cry Sleep Solution" is really well-regarded, especially among AP parents. I think the "Baby Whisperer" stuff is pretty gentle, as well.
I just don't like the abandonment and the feeling of fear/isolation that CIO requires, especially when it's taking kids an hour to scream themselves to sleep. At 16-17 months, a kiddo has a lot of brainpower and emotion, and it hurts my heart to think about what thoughts/feelings they have in that hour, simply because their parents demand they fall asleep on their own. Yeah, a kiddo has done it before; but something changed in their psyche and now they have a hard time with it.
Just my two cents' worth. I've deal with crappy sleep for almost 21 months now, without doing CIO. We're talking 1-2 hours of nighttime rigmarole before the little one falls asleep. And she will fall asleep, on her own, in 5 minutes at daycare. It's frustrating, yeah, but I'd rather support and nurture her through the rough patches than ditch her to scream herself into exhaustion ...