Hi J.,
i've been having issues with my 18 mo old as well. he was the perfect little all night sleeper until about 2 wks ago. it all started with congestion that he was having that would wake him up at night...followed by teething(the sharp teeth). The last 2 nights, he's only woke once which is better than the previous 2 wks in which he'd wake up 3-4 times every hour or so. At first, I was getting him out of his crib,rocking him,putting him in bed with me. Some moms advised that I not take him out of the crib and instead, offer him a little water,and then lay him down and pat his back,singing or talking softly until he fell asleep again. Do not turn the lights on either. I've done this the past 3 nights and I'm hoping tonight he'll go back to sleeping all the way through. So far this method has worked for us and we havent had him in our bed for 3 nights. It's nice. :) It may or may not work for you but you may as well try. The first night I think I stood over his crib soothing him back to sleep for like 30 minutes twice throughout the night...and the last 2 nights only 5 minutes for one time only. So its getting better! Cry it out only worked for us when he was 6 mos old. Now, his cry is way too strong and loud for us to endure. So that method is OUT. The moms on this site gave me great advice and so far its working. Now if I could just get my son to regain his old eating habits, I'd be in mommy heaven. :/