Baby tummy sleeping

My 5 month old son has just decided that he wants to sleep on his tummy. He started rolling from tummy to back at 9 weeks but once he started rolling from back to tummy at about 14 weeks he no longer rolls back. He falls asleep on his tummy and wakes up and cracks it because he can't get back. Do you have any suggestions for me in regards to this or had the same issue? I really don't want to be up numerous times a night rolling him over and resettling... especially because he ends up rolling back to his tummy again 😑😑😑