I have a foster child of 3, who is a really bad sleeper. There is a history of neglect and abandonment. Child has a bad habit of grizzling to get attention/get what they want, and this can go on for hours. This is down to being ignored for much of their little life.
So child has started to wake at 10ish, and grizzle and call out for the next 2 hours. We go in, sush, pat, offer drinks, ask child to be quiet, give cuddles - and still the wailing continues for up to 2 hours. It is quite deliberate, and a strategy that worked in previous life - child would be put into bed with older sibling previously.
Child shares room with sibling at ours, so both children sleep deprived. Sibling is significantly older. The next morning, child is up early (6ish) and grizzling from tiredness. Sleep in the afternoon just doesnt happen (more wailing, screaming tantrums etc) and we are all on edge from lack of sleep and the constant grizzling and stroppiness that accompanies the lack of sleep.
I would use controlled crying, but child has abandonment/attachment issues, and can hold out longer than I can - so what to do?
I cannot sleep in with child, I cannot sleep in room (no space) I cannot just leave child to cry (sibling) and I cannot drug child 
Anyone have any strategies that i could try?