Could this be 4 month sleep regression

So LO is 4,5 months old.He falls asleep around 9:30-10 for the night and then he would woke up around 3,4,5 he would start crying I put paci and he would go to sleep and after 15 minutes let’s go again.Ge can’t fall asleep really fast after waking up so I would put him next to me so both of us can get sleep but I don’t want that anymore.