DD is 2 and crashes by 7 - 7.15pm, she just can not make it any longer than that. Up at 5am like clockwork, has started happening ever since we moved her into a bed a month or so ago, prior to that it was 6.30 - 7am. She naps for around 1.5 hrs after lunch with a couple of 3 hr after lunch sleeps towards the end of the working week. Nothing seems to affect the 5am wake up, if there was a way to extend it I certainly would. I can't believe the other day I was so excited she 'slept in' until 6am lol happens very randomly.

ETA I didn't mention that some nights she sleeps through, others she doesn't, can be up a few times through the night. Doesn't affect the 5am wake up either if it's been a broken night or not.