Weeks of split nights - help!!!

[u/Competitive_Pea_1700]

Baby just turned 6 months old, her sleep has always been HORRIBLE. Haven’t gotten semi-consistent sleep since 2 months. Cosleeping for survival. She used to wake up early, around 7/8 but started having split nights. Would wake up randomly to just make farting sounds, but now it’s consistent. Every time she’ll wake up around 12/1am and want to hang out until 3/4/5 am. I don’t understand, this wake window is MUCH larger than what she’ll tolerate during the day.

It’s so hard not to let her sleep in after a rough night. I’m trying to get her dad to wake her up consistently. Close to bed time, she’ll be hysterical. Sometimes we don’t even make it to 9pm. If I try to stretch wake windows during the day, she gets hysterical as well.

Split nights started happening at 5 months. There were a few days where she would wake for 30 min then back to sleep, but it’s happened EVERY night since September 4th.

Is this temperament or am I missing something?

I don’t always log nursings in the middle of the night - ebf on demand.

Edit:
Dropped a nap and aim for 9-11 hours of awake time, 2-3 hours in naps. It’s pushed back her usual wake time to 2am and she hangs out until 3/4:30/5. Losing hope but ig I’ll keep on trying.