Toddler wakes up at 4am

So, my daughter is 19 months old. She's amazing, except that sleeping has always been a struggle. Her bedtime routine starts at 6:30, and she's usually in bed asleep by 7:15. A few weeks ago, she started sleeping through the night for the first time, and was consistently waking up between 6 and 7, which is when we need her to wake up for all of us to get ready in the morning. It was amazing.Then this week, she started waking up between 4 and 5:30, and most recently she's been waking up every morning at 4. This is excruciating. She will not go back to sleep unless my wife brings her into bed with us and breast feeds her until she falls asleep and then we keep her in bed with us.I know co-sleeping works for other families, but it doesn't work for us. It keeps my wife from sleeping at all, and I'm terrified that I'm going to roll over and crush my daughter, or even just punch her or something as I toss and turn.Does anyone have any suggestions for how we can communicate to her that 4am is not an appropriate wake-up time? Everything we've tried at this point (crying it out, talking to her about how it's bed time, making her bedtime later and earlier, breastfeeding her in her bedroom) has worked. And I guess I should point out that the 4am-wake-up thing started happening a few months ago, but we thought we were through that phase. It's not that we've tried all the approaches I just described in the last week.Thanks for your thoughts. via /r/Parenting http://ift.tt/2l8vSSL