Self soothing tips

Lena

My 3,5 months old son needs to be rocked to sleep, and when he wakes up in the night ( which happens so often in the last 10 days cos of his sleep regression) he can’t fall back asleep on his own or by me just shushing, touching him or swinging his bassinet, he needs me to rock him all over again or taking him to my bed. Is there any advice on how to help him self soothe? Or it early for that?