6 month sleep regression?!

My 6 month old fights sleep. All of his naps, he grunts, screams and cries. We have to rock him to sleep for about an hour until he finally sleeps. Is this the 6 month sleep regression?? My husband and I are struggling soooo much. He used to be so easy to put to sleep, it’s become nearly impossible now 😭 Does anyone have any tips on how to manage this?