yep - that is what DD1 went through at about 2yo, it was terrible. It went on for about 6 months and we know it was caused by a huge upheaval in our family at the time. XH and I used a team approach, he would wake her up, and then she would come to me for comfort and I would get her back to sleep. But I have heard of other ways of doing it, but cant remember them at the moment.

HTH