Sleepless

My son used to sleep from 9 pm to 3 am then he'd wake up at 7 am for the day. His sleep has gotten worse ever since 😕 Now he sleeps from 9 pm usually wakes back up around 10 pm then sleeps until 2 am then wakes up every single hour and wants bottle. He won't drink it all but he wants it. He won't except his pacifier. I don't know what I'm doing wrong. I haven't done anything different as far as sleep time goes. I don't know what to do 😓 I'm so tired. Any help?