I'm a side sleeper...tried to sleep on my back and couldn't sleep at all. I use https://smile.amazon.com/gp/product/B07 ... UTF8&psc=1
from amazon. I buy all my supplies from amazon since my insurance doesn't pay for any of them. I've tried the pillows - went from medium to small...and then the nasal cushion. I actually go back and forth. The medium pillows actually gave me a sore on the inside of one nostril. In comparing prices I paid less than half of what you pay if you go through other on-line stores. When I was first diagnosed my insurance paid for 80%...but like I said....not anymore.