Sleep regression

So from like 3weeks to 3 and a half months my son would either sleep all night or wake up once around like 4 am Well he went through sleep regression and was waking like 3 and 4 times a night for about a week and now he is sleeping better but he still wakes up around 2-3am every single night. He's 5 and a half months now. I had hoping he would go back to sleeping all night but I guess not. Yes I know I'm lucky that he only gets up once but once you get used to them sleeping all night it's tough lol