Loud, chronic snoring is one of the most frequently cited symptoms of sleep apnea. Snoring is the sound produced by vibrations in the upper respiratory airways during sleep. It is caused by partial blockage or obstructions as air is being restricted from moving easily through the airways. Many people who snore may not even be aware that they do so and are only alerted to it by an annoyed bed partner whose sleep is disturbed due to the loud noises coming from the other side of the bed. While snoring is a common symptom of sleep apnea, it doesn't necessarily indicate that the person has the disorder. Many people who snore don't have sleep apnea, and some people with sleep apnea don't snore.