Sleeping questions

[Nightmare]

the 1st few days i slept on my back  cause of the swelling and pain of my chest. I'm 6 days in, and most of the pain is gone and i can sleep on my tummy.
I was thinking, is it ok for me to sleep on my tummy and i have place a pillow under my chest to help it flatten my chest out during this healing process.  Is that ok to do? i did that for a few hours and realize it really helps me flattening out my chest alot.
is it ok for me to sleep in that position for the whole night?

[lookinup]

My ps told me on the back or stomach was the best. Sides are not good. As you said on your stomach helps compress your chest.