This pillow has actually caused me, a side and belly sleeper, tio remain on my back for 9 hours! I have many many physical and medical conditions that cause me to roll on my side! I use a CPAP and my dr wants me to remain on my back to sleep. This has been an uphill battle. Last night, I was amazed! I woke up with 0 neck pain!  And the nest sleep in years! Even my boxer, Hildy, knows a great product! She used it this afternoon for a nap!