This is a little soon to hit the panic button, but DD has spoiled me by being an awesome sleeper since about 5 weeks, and it being 3:30 am and the fact that she JUST fell asleep after 2.5 hours of being WIDE awake, I figured I'd do a little brainpicking since I can't sleep now.
We never experienced much day/night confusion, and with the exception of tonight, she has never woken up during the night for any reason except to nurse for maybe five minutes (and even then, she doesn't wake up more than once or twice between the hours of 9pm-6am) before going right back to sleep.
She is 12 weeks old today, btw, but was born two weeks past her due date, for what it's worth.
Last night, we put her down at 7:30 pm, on her side and unswaddled for the first time, and she slept soundly next to me til about 12:30. Then she was up with a vengeance. Not cranky at first but giggly and like haha it's playtime, mommy! She has NEVER been like that before during the night! After an hour of that and me failing to resettle her, I brought her into the living room where I rocked her, tried to put her in her rocking bassinet. She was having none of it, and kept spitting out her pacifier, another thing she never does at night--she loves that freaking thing when she's done nursing!
Her mood went downhill from there and trying to bf just annoyed her even more. The only thing that seemed to keep her from losing it was gnawing (not sucking, gnawing) on my finger--again, something she is usually uninterested in. It kind of felt like one side of her gums was protruding a bit more than the other. But when the novelty of the gnawing wore off, she started fussing, and I eventually swaddled her arms as tightly as I could, popped her in the swing, gave her a pacifier, and within a few minutes she was asleep. That's the story.
So...does this sound like sleep regression? Teething? We just started sharing a bed (she's in the crib, sidecarred) and I don't know if that change in routine is throwing her off, too.