Hi there
My little man is exactly the same. He is 5 months now and rolling all over the shop! He wakes at 40 mins, has a shuggle and a roll and then settles himself and goes back to sleep, but sometimes it can be anything to 5 mins up to 30 by the time he has fully gone back off.
I never have to go into him and he sleeps for another hour or so on top of that (I never let him sleep over 2 hours).
To be honest I am just glad that he is not waking and crying and I have hours of pat/shush!!
Take care
Lizzie xx