We must be living parallel lives. We go through this cycle too with DD2. The most recent trigger was a really bad cut to her mouth and at 5am it's so tempting just too bring them into bed for a BF and cuddle! Each time I get exhausted after a good month or more if it and then I send DH in to get her up and take her downstairs. She kicks up an almighty stink but it cures her of early call outs in 1-3 days. She's slept until 6 or 6.30 the last few mornings and we've showered her in praise. I hope you get some later sleeps. The early mornings are hard!!