Side sleeper! Help !!

My 6 month old baby absolutely refuses to sleep on his back. He has become a side sleeper and rolls to sleep on his tummy facing down! I tried countless times but nothing works. I’m scared he might suffocate or something. I read articles that mentioned to avoid side sleeping to prevent SIDS. It’s 4 am and I haven’t even slept, been trying to move him while he’s asleep. Nothing working!