Sleeping habits for 1 week old

Marie • Hello, my name is Marie, I'm 27 years old and I joined this website the moment I found out that I was pregnant. This is my first pregnancy and I'm praying for a 100% healthy baby boy or girl 😊
My son is a week old and from the first day I watched him sleep, I noticed that his eyes roll back and then he smiles and then it stops like he snaps out of it...it literally happens every time he's falling asleep. Does/has this happen to any of your babies? Should I be concerned?