Hiya bird
Just sticking my two pennies in here cos im a bugger like that.
Firstly can you write down as closely as you can your routine during the day? Often what happens during the day has an impact on what happens during the night, its very holistic.
Are you on an EASY routine? And what do you do when you wind her down? In the meantime til you can get back to us and us to you do by whatever means neccasary get as much sleep in as possible, can your dh take over for a few nights or even just a few hours so you can get a snooze if you have to deal with this alone? I say that cos i bloody had to! :evil:
I wsuspect a few things, and this isnt a critasism cos trust me i realise and know how desperate it gets when your that knackered and dont know where to even start!
One is that its fairly inconsistant how your dd is going to sleep, maybe in her cot, in your bed, fed to sleep, cuddled etc. The key to the whole thing is consistancy so your dd will know by what your doing, where she is and what to expect from it.
I think you've also inadvertently become her prop, she NEEDS you to be able to go to sleep, you may be able to get away with it for one or two nights but by the third change in routine....she becomes to rely on it.
I agree it has a lot to do with sleep cycles, it takes twenty mins to go through three stages on sleep, often it takes twenty mins at least to get relaxed enough to get there hence the 30-1hr wake up.
Whats happening is that your dd will reach the lighter part of her sleep pattern, wake and because she is unable to get herself back to sleep she looks for you to enable her to. Does that make sense?
Aonther element i think is that it can become an inevitable pattern, her sleep rytham to wake at this mark so i beleive your looking at re-sleep training from scratch.
Get back with the info i asked you and we'll see if we can come up with somthing, your routine, how she goes to sleep? Her wind down routine?
Wake period? What you do when she wakes? etc.
Hth