Rolling over while sleeing

So for the last 2 weeks my 6 month old has been rolling over in his sleep and he HATES sleeping on his belly, so I’m currently waking up 5-6 times a night to adjust him back to his back or help him stabilize on his side (normally once on his back he rolls over to his side within seconds, but he can’t control how far over he rolls and ends up on his belly). Is there anything I can do or use that’s SAFE to prevent him from rolling over all of the way? I’m a tired mama, going through the 1st trimester exhaustion phase, but I don’t want to risk my babies life for sleep, so if I just need to wait it out I will.