Your sleeping position may be affecting your back!
UImproper posture while sleeping can cause pain in neck, back and shoulders.
Two basic rules:
. Avoid sleeping upside down.
. Keep a neutral position when sleeping sideways or upside down.
Sleeping upside down forces your neck to turn to one side and keeps him trapped as long as you are asleep. This can certainly cause irritation to the spine and the nerves of the neck and shoulders.