Stormy - I'm so sorry too, what sad timing for you. Similarly un-MN-ty hugs to those of you without DMs to see you through this phase of life.
We're back to sleeping through here, and I have sussed the problem. Mixed feeding. Sad though it may be now we've started down that road I am going to have to switch 100% onto bottle from here on in, as the combination option just isn't working.
Firstly my milk has adjusted right down to the point where she just isn't getting a full feed when she needs it, and second now she's discovered bottles she has got lazy. She uses me for snuggles and comfort but doesn't drink enough. For the past two days I have expressed the feeds she'd normally have from me, and she has slept through. I feel terrible as I have been unwittingly under feeding her, and both DH and I had noticed she had become a little thinner 
I guess this is why all the books say 'don't be tempted to supplement with formula during growth spurt weeks' as it really does mess up the balance. I have always been someone who has had way too much milk before, and the tiddler has always been a very very committed eater so I really didn't envisage there being a problem with going down the mixed route. I feel like the ultimate bad mummy, and I mean that seriously not in my usual flippant way.
On a more amusing note, I have learned that taking her-maj to one of those family run cafe places on a sunday morning (you know the ones.... fab food, but incredibly slow service) is a bad idea. We only got to about 10th on the list before we'd used up all our quiet baby credits and faced the ultimate meltdown. DH nearly cried as I walked him away from the carrot cake.
The sun has disappeared today. DD will be thrilled, she doesn't do summer apparently.