sleep regression, how bad is it?

JK
I just want to hear from other moms what they experienced with sleep regression and around when? I feel like my 4 month old is finally getting a schedule but he is now waking up more around 5 am now rather than 630/7 am. Is this sleep regression? When did it get better for you? What age did your little one start not needing the night feedings and slept thru?