Sleepless nights...for 15 months!

Hurdle number 2, that we are not even close to jumping over...sleeping through the night. My husband and I have not had a full night's sleep until before Blake was born (he'll be 15 months on the 16th). There was a small time frame, while I was pregnant, that Joseph slept through the night. But as soon as little brother entered the world, we have had 5, and I mean 5 full nights of sleep and 2 of those were because the boys spent the night at my mom's house. Again, we have tried EVERYTHING! Letting him cry it out, going to him, sleeping with him, letting him sleep with us, shutting the door, giving him prizes for not waking us up, slowly creeping out of the room, moving further and further out of the room each night (Ferber method). Our current remedy, suggested to us from our doctor, has actually helped until the last couple of nights. This only involves about one waking in the night.  The plan is to let Joseph come in and sleep on our floor (pile of blankets). The deal is he can come in as long as he does not wake us up. I thought there was no way this would work, but the first few nights were great (but of course these nights Blake got up in the middle of the night, so we were still without a full night sleep). However, recently, Joseph still manages to wake us up. And oddly enough, it's not when he comes in to the room. I have actually been awake when he first comes in and he quietly goes to his blanket pile and lays down. No it's sometime after that that he wakes up, "Mom, cover me." "Dad, there are monsters." "I can't find G (his little lovey)." Once we figure this out, I will be sure to post what we did!!!!