Help! My 12 week old is driving me slowly insane! During the day she is a dream- she feeds after a sleep (bf), she is awake for about an hour then shows sleepy cues, I put her in her cot and she falls asleep easily and sleeps for an hour. Sometimes there are variations where she might fall straight back to sleep after her feed or sleep for 2 hours instead of 1 but this is generally her daytime pattern. In the evening she has a bottle (we are trying to get her to take a bottle more reliably so that I can leave her with my partner sometimes but it doesn't always go smoothly!) when she wakes about 6pm, then she has a bath, massage, pjs and into her cot- again, she usually falls asleep easily like in the daytime but only stays asleep for an hour. After that she is difficult to settle and can stay awake til 4 or 5am most nights!! We have tried everything- keeping her in bed, getting her up and rocking her to sleep, repeatedly popping her dummy back in, getting up and treating it like a day nap and doing feed and play for an hour, ignoring her in the hope she goes back to sleep, etc! When she eventually does fall asleep she will sleep for a good 5hours, but often that means she isn't waking up until well into the morning. I've tried extending her awake periods in the day but it is physically impossible- she falls asleep even mid play! I'm not expecting her to sleep through the night as she is bf and still only 12 weeks but I just want her to sleep at all at night! Sometimes she is really chilled in the night and is just awake, other times she is grumpy and cries, but he most sleep she gets is little bits of dozing before she wakes up again.
I've trawled the internet for advice but all the common sleep issues don't apply- she can self soothe, she sleeps fine in her cot, she naps nicely in the day, she can go long periods without feeding...!
Any advice?!