I wish I could train myself to sleep on my back. I've been trying for years, but I can't seem to fall asleep without the pressure of the pillow on my face.
Apparently [1] sleeping on the side is better for your health, as well.
I had to learn to sleep on the side after smashing a vertibrae in a climbing accident, no other position offloads the spine as effectively.
I also can't sleep on my back but have no urge to change that.
I don’t have a flat face (yet?) though I can see how that could be annoying.
Then we got an overpriced mattress with the same material that NASA uses...
I'm an endless chaser of value. I hate to overpay for things. That mattress was $5k (king sized).
She sleeps on her back, and her sleep quality has measurably improved.