5 month old moves alot in sleep

Hi mummies, my 5 months old have started to prefer sleeping on his tummy. Yes his neck is strong he can lift up and love tummy time. However, when he sleep in tummy position, he always always like to rub his face against the mattress, and sometimes burry his face down on the mattress, but sometimes also he tilt his head to the side. He wont stop moving when sleeping now, either he move his body, or keep rubbing his face. But he’s asleep. Ive tried changing his posiiton, be it on his sides or back, but he would always end up on his tummy. And im a paranoid mum, due to this i never had a good sleep altho he slept thru the night. I keep waking up every few minutes to check on him. To change his head position etc. To the point that today i had to take mc cause my head was spinning so badly i couldnt even walk stably due to the lack of sleep and maybe multiple sudden wake ups. Any mummy going through this too? And how do you manage it ? He’s not swaddled(he hates it now), firm mattress, only his pacifier on the bed, white noise, very dim light, sometimes we use the beansprout pillow. What else should i do I miss the time when he used to sleep soo peacefully without moving much. I dont wish to co sleep or contact nap as i dont feel its safe. And yes he’s sleeping in cot with cot against our bed because of this.