It's very common unfortunately to not sleep during the day and drink better at night. The reason is that they are so exhausted by nighttime that they sleep. And they feed well cause there not really awake enough to fight it.

I find one of the first signs for my girls that their reflux is out of control is that they stop sleeping much at daytime and are hard to settle. Also that they stop eating and drinking.
It really does sound like reflux to me, and with her getting quite fussy about drinking it's something that you need to get progressing sooner rather than later. Hopefully the Paed tomorrow will offer some medication, cause it does sound like she needs it. My girls reflux was so out of control that Claire ended up in hospital at 2.5 months with dehydration from refusing to feed, and both girls developed major bottle aversions that took about 6 months to overcome (and we were very lucky to achieve it!) It got to the stage where I had to feed the girls while they were in their beds asleep, cause the minute they waked up they would see the bottle and stop drinking. So the sooner you get the reflux controlled, the better you can avoid this ....
So try things like putting the tv on, or off, blackened room, walking around, etc. Basically babies will sometimes want NO distractions, and other times want LOTS of distractions. I still have to feed my girls with no one else in the room (ie no visitors) cause they barely drink. But at least they drink while up and awake now .... But yeah, they drink HEAPS better while asleep and at night time. I know one mum who bf (I only bottle fed) that would go in before bubs was ready to wake up and gently move them onto the breast, that way they drank better.
Fingers crossed the Paed has some good advice to offer.

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Me, DH and twin DD's - 4.5 years old already!
DD1: Undiagnosed metabolic disorder, reflux, food intolerances, asthma
DD2: Mild autism, food intolerances, reflux.
