DD is 3mo and was settling into a bedtime really well. I'd put her down in her cot at 7:30pm and she would wake every 5hours or so to feed and then sleep until 7:30am which was great. The past few nights however have felt like a fucking war and I don't know what's happened! She can't fall asleep in the evening and when she does only sleeps for half an hour and then once it gets to midnight wakes every couple of hours. She's refusing the boob in the evening (she's ebf) and then only feeds a little every time she wakes up. Her daytime naps last about 30 minutes and I try not to let her stay awake for longer than 1.5hours because otherwise she gets overly tired.
I am sooo tired. Is this sleep regression or something else?