In all reality, this comes down to the way in which you sleep. If you sleep on your stomach with your head turned to breath, your putting undue pressure on many important parts of your body, not the least of which are your neck and back.
Have you ever woken up and started to move, only to get a pop and heat sensation from your neck or back? Many have and they assume it's simply because they slept wrong that night. If you're habit is to sleep wrong every night though, it's no wonder you suffer pain and discomfort.
Hands down, the best way for your body to sleep is on your back. The only thing sleeping on your back isn't good for is snoring. If you find it difficult to sleep on your back, you could also sleep on your side with a pillow between your knees.
If you don't have the discipline to learn to do either, you can continue suffering in pain and getting adjustments.