DS is 15 months old. We were so incredibly lucky in that he has always been an excellent night sleeper. From day 1 he STTN (well, until 6 months or so he would have a night feed or two, but we cosleep and neither of us would really wake up for that, so I still count it as STTN).
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....until recently. For about three weeks now he's been sleeping solid from bedtime (which is anywhere from 8:15-9:30pm depending on various factors) until around 2am, then he wakes up and is hard to resettle. He either outright cries or is just really whiny and upset. He usually has about 2-3 of these wakings where he seems upset and is hard to settle ~one at about 12-2am and the next around 5 or 6, sometimes with other times mixed in there (normal morning wake-up time is about 7:30)...but in-between he's just really tossy and turny. The result for me is that I only get a few hours sleep and then once he starts tossing and turning and waking I sleep only lightly, and I wake up in the morning feeling like a truck hit me.
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I know we were lucky not to have gone through this in the first year. I know this is normal for parents and I just need to accept it. I know this is a phase as everything at this age is a phase. I am assuming his brain development is going wild and this night waking is just a side-effect. What I'm wondering is: have others gone through this too? Specifically that your LO was a very good sleeper (STTN) for a long time and then suddenly became a night waker in toddlerhood?
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I was foolish enough to believe that since we'd made it this far with mostly only good sleep, that we were home free and he'd always (with exceptions of course) STTN. I've been thinking about trying to get him into his own bed, that maybe he'd sleep better if he were alone...although intuitively I don't believe that will help, and he may even sleep worse and it would be even harder for me if I had to get up to go to him, ya know. I just know this is taking a toll and I am a grumpy person most mornings and it's a real challenge.
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I guess I just want to hear from someone that they've BTDT and that indeed it will pass, or at least some commiseration from those going through a similar story. 
Thanks!






