Many people enjoy sleeping on many soft and fluffy pillows during the night. In fact, when you ask someone how many pillows they have on their bed, chances are that the number is much higher than one per person.
However, when you are trying to alleviate pain in your upper back between your shoulder blades it is a good idea to ditch all of the pillows on your bed. You should choose to sleep on one semi-firm pillow at night. This will help keep your body in line while you are sleeping. When you add in a bunch of pillows it elevates the neck.
This can cause you to go into all types of weird positions that are not natural. When you are sleeping on more than one pillow it can cause tension between your shoulder blades because of the angles. If you are experiencing upper back pain, try sleeping with just one pillow.