Hey Lulu, wanted to drop in and let you know I'm thinking of you. I have nothing to suggest to you, but it sounds like you are working it all out anyway.
Did you have the assessment with the sleep school? I was wondering if you expressed your concerns about the effect DP's antics have on the kids to a councellor, and then they spoke to your DP and suggested he get it together that he may take it more seriously, KWIM?
In any case, I really hope things sort themselves out for you one way or another. Dealing with crazy bedtime antics is nooooo fun at all.