We have just changed Kaetlyns sleep routine. Although she is only 3months.
She was wiggling out of her wrap. we would wrap her, then wrap a muslin wrap around that to hold it. Putting her in it she was screaming. She was then waking up cold after getting out of her 'straight jacket'.
So....
I brought some sleeping bags and went cold turkey one night. And have had no probs since, touch wood, its been 4 nights now.
She used to be a jerky sleeper, but now she seems to settle herself in the night time which is a god sent!!
I guess try cold turkey and if that doesn work, try and wean her.
Good luck!!! I know it can be scarry!