Sleep Apnea Support Group
Sleep apnea is a common sleep disorder characterized by brief interruptions of breathing during sleep. People with sleep apnea partially awaken as they struggle to breathe, but in the morning they may not be aware of sleep disturbances.
Try it while laying down in the daytime and see where the noise is coming from. It's easier to fix if you're not trying to sleep through the noise. It can sure be maddening trying to get it to shut up while you're trying to sleep. If you can recreate the noise, you'll know how to stop it. Place the pillows at different angles. If it's wrong, it makes noise. If I move it a bit, the noise stops. I'm confident you'll get it to behave for you.
Good luck dear.