delara, I just wanted to say that I think that your points are valid (I don't think you should suck it up) and that your DP needs to see that continuing in this way will only make his DD more "different". I know that 6 is still young so being close to her dad (on the same floor) is probably still a good thing, but the independent sleeping is something that needs to be started soon. Maybe DP needs to let go a bit too?

I might add that I don't have any kids myself, but that's just my thoughts.