So my little one is 2 days from being 12 weeks old and for the past 3 nights things have gotten so bad with sleep!! for a while now she had a perfect bedtime, around 8pm, and after a feed would sleep from 4-7 hours in the night. However recently she has not been going to sleep like she usually did and now will stay awake from 8pm to almost 12am being very fussy and super wide awake. During the day she will eat play then nap for a bit and eats every 3-4 hours but once it hits that time when she used to go down for the night she will eat every 2 hours.... what is going on?? how can i fix her nighttime sleep again