Rolling over is ruining our sleep!

Natalie
My LOnis 5 months old and just learned how to roll from back to tummy which is great except it is ruining our sleep.
I will put him down to sleep on his back and he ends up rolling onto his side and will eventually roll to his stomach, waking himself up.
Anyone dealing with this? I haven't let him cry it out too long on his belly but do I keep going in and rolling him back over? Let him stay on his belly? Help!