Boycotting sleep 😩😩

My son is almost 9 months old (October baby that came in September) and he had previously been an ok sleeper. Would usually get up once a night to eat then go right back to sleep. But lately he has been taking shorter naps and has been waking MULTIPLE times a night. He still usually only eats once but the other times he wakes up and just whines and rolls around 😩 I don’t know what’s going on but I’m so tired. Anyone have any advice? My older daughter was not like this 😭😭