Snoring is caused by the airway being occluded during sleep by laxity in the throat or sickness such as a cold.
There are some pillows you can get that help force a posture that aims to prevent this. If you are stopping breathing in the middle of the night this could be sleep apnea
. Apnea frequently causes snoring and can be evaluated by a physician.
Answer assisted by Garrett Caldwell, Medical Student