hi L., though i havent been incredibly successful in the sleep department, i have gotten both of my kids to start sleeping in the crib, and it was at about the same age as yours, when they stopped nursing, and i did it without letting them cry. most people will tell you to let them cry, it is what most people do, and it does work. at 18 mos, he is probably manipulating you more than being actually scared, its not like letting an infant cry. and i will tell you that if you are going to go that route, you have to stick with it, if you let him cry for a while and then give in, youre only teaching him to stick with it, that you will eventually save him if he keeps it up. so if youre going to do it, do it. if not, here is what i did with my son, i got a comfy chair and a book for myself and sat with him, read him a few stories and then held his hand thru the bars till he fell asleep. stop interacting with him, just sit quietly at that point. i then separated gradually, started letting go sooner, before he was asleep, then started slowly moving my chair further away from the crib each nite, you get the idea. it took a few weeks, but it worked. with my daughter its about the same, but she is even more determined, i had to start by just getting her to lie down, which i did by telling her to lie down or i was going bye bye, then i would follow through, she would cry for a minute, i would come back and do it again till she got the idea. this only took a few times till she started laying down on her own, then did pretty much the same as with my son. and when she wakes up during the night, i go to her and do the same thing, i do not take her out of the crib once she is in, unless she is really freaking out and i have no choice, and then it sometimes takes a couple of nights to undo that! if you have the patience to try this, best of luck to you, if you have a comfy chair for yourself and start early its ok. take care, D.