Can it be done? M used to sleep great, but it all went awry when we went on vacation a couple of weeks ago. Since we've been back home, he's been waking up in the middle of the night and crying unless we bring him into bed with us. Then he goes back to sleep in our bed, but DH and I don't sleep very well.
We tried doing a modified Ferber for two nights, and it was a total failure. The first night, I gave up after about 30 minutes, because he was screaming like the world was ending and I just couldn't take it anymore. The second night, DH tried to do it, but M
refused to go back to sleep in his crib. DH was up with him for hours. I think kiddo has gotten more stubborn! Any advice?
In case anyone is wondering, M doesn't really have a lovey. Honestly, I think I'm his lovey.

He does sleep with a teddy bear, and he likes the bear, so maybe I can try to get him more attached to it as a comfort object. Any tips on how to do that?
Re: Sleep training (Ferber?) a toddler?
Yes, sleep training a toddler can be done. I've used Ferber/CIO method and also a lamp on a light timer. We started using the light timer right around DS's first birthday, so it might be a good time to give it a try. The method is cribbed from maybeachbride - hi if you're reading this!
We have a lamp in his room and a timer we got at Home Depot for $15. The lamp goes off a few minutes before bedtime. We make a big deal out of the fact that the light is off and now it's time for sleep. With middle of the night wakeups, you use Ferber and reinforce that the light (which he should be able to see from his crib) is off so it's time for sleep. The "light off" time should be 11 hours for a one-year-old. Then, in the morning when it turns on, you reinforce that now it's morning and time to play! Like Ferber for us, it took 5-7 days of reinforcing before it clicked. And my DS has never had a lovey either. And I'm guessing some of this is because you're weaning and not nursing at night either?
Like any sleep training, the key is consistency. If M knows that you'll eventually break down and he gets to sleep in your bed, then he will fight until he achieves that outcome. I'm not knocking co-sleeping if you want to - but if you don't want him in your bed, sleep training is an option.
We did it when J was 16 months. We hadn't done any sleep training to that point, and he was a great sleeper (usually 11-12 hours straight at night with no issues falling asleep on his own) EXCEPT he was still waking up around 4am to eat.
Since I had stopped nursing, we decided that needed to end, so we tried Ferbering. It blew. He was so mad that we were going in and not feeding him that he got even more upset. The first night he cried for at least 45 minutes straight.
After that, we decided to go cold turkey and not go in at all. He didn't cry nearly as long the next night, less the night after that, and since then - no crying.
He does have a lovey, though - a Taggie blanket. He uses a paci, too, but only for sleeping. Have you tried that or something similar? They help him a lot when he wakes up disoriented.
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if he doesn't take it at night, I wouldn't encourage it. Dr. Ferber is a big opponent of any sleep crutches and a pacifier is one of them. Why give him something you'll just have to take away soon anyway?
as a disclaimer, I am not a big fan of pacifiers and believe they are especially harmful if babies have teeth. I was very lucky in that both my kids gave theirs up by themselves very early, 4mo for DD and 6mo for DS. So I do have a bias against them (my own issue, I know!)
No, I'm not a huge fan of pacis either. He used to STTN without one, so I know he's capable of doing it.