we took one side off the cot bed on saturday, and so far, so good - DS (22 months) has gone from a 2-3 hour scream and vomit-athon (he would make himself sick, even when we were in the room with him, sometimes even when we were holding his hand) to a 20-30 minute lie down and nod off (whilst one of us sits in a chair in the door way). and he has slept through both nights too! this is actually unheard of, so we are VERY pleased!
however, both nights, when we go to check on him before we go to bed, he has been sleeping on the floor. 1st night, flat on his back in the doorway 
(I nearly trod on him!), 2nd night, under the cotbed, with just his head peeking out the side 
. luckily, he stayed asleep when being replaced in his bed, but I was just wondering how long he is likely to do this, and would a guard rail help?
sorry, this is slightly ponderous musing...