<human>: My 14-month-old girl, who has yet to sleep through the night, has thrown me a new curve ball and has started waking up for at least an hour, sometimes 2, during the night. I thought this was just a Wonder Weeks/developmental milestone type of thing at first, but it has been going on for a little over a month now, so I'm getting suspicious that there might be something else going on. 

Some points: 

* She is still nursing and usually nurses down to sleep. When this happens, though, she will just nurse with her eyes wide open and then lay there staring at me when she's done

* "Cry it out" is not really an option for me in this instance for a variety of reasons which I can detail for anyone who's curious

* She usually goes down around 7 or 7:30. Her longest stretches of sleep are typically at the beginning of the night (from 7-10 or thereabouts) and just before she gets up. Before she started this whole "awake for two hours" thing, she would usually be up between 5:30-6:30 most days. 

* It's usually after a diaper change that she can't get back to sleep. But not changing her doesn't seem like a great option either, because she's usually super wet by 2 a.m. and often the diaper will leak at that point if it's not changed

* She USUALLY is pretty calm and relaxed during this awake time. She will sometimes fidget a little (kicking her legs, stroking her blanket) but the majority of the time, she's relaxed. Just ... awake. 

* Things I usually try include rocking, bouncing, shushing, singing lullabies, putting her in her crib to put herself to sleep or just holding her in my lap and sitting still. 

* The only thing I have found so far that "works" is just time. After an hour, hour and a half or so, she usually will start to fall asleep and I can get her down into her crib successfully.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: 14-month-old baby wakes up and stays up every night for an hour or so. Why. Please help.