D.M.
I've been there. We got to the point where we will lay w/ her and read until she falls asleep. However, we have friends that would put him back in bed, and then be "there" sitting in bed, then at the door, then in the hall - so he know he wasnt' alone... and kept putting him back in. Took forever, but was a bit softer approach. I couldnt' do either, so she is in with us by 4am - at 3 years old. I've made the choice to "enjoy" it while I can. We each have to do what's right. Hope you find a solution for you guys - no sleep is no fun!