I dont know why but the last 3 days my 3 month old had decided that she doesn't want to go to sleep. It's never much of a fight but after she wakes up after her afternoon nap she's grumpy 2 hrs later. But if we let her go to sleep she won't go to bed at 9 like usual. But the past few days it doesn't matter. Because sleep or not she's up until 1-2 am. But once she goes to sleep she's out 7-8 hrs. I've tried to keep her naps shorter to see if it would help but it's not making any difference. Any tips? On how to get her to go to bed preferably by midnight.