Cluster feeds at 5 months (almost 6 mths)

My LO will eat for anywhere between 4-7 minutes at a time, and I try everything to get her to eat more and she won’t. I’ll wait about 10 minutes and try again and sometimes she eats for a couple more minutes, or if she doesn’t I try the other side and see if she’ll take that and it varies. I feel like she doesn’t sleep well at night (wakes almost every 2.5 hours, sometimes less than that) I’m dying of no sleep.. and wondering if anyone has advice!!!