If you have already been treated and still have facial or facial pain, you may experience sleep disorders such as bruxism or sleep-related breathing disorders such as snoring or sleep apnea. Bruxism is a technical term for grinding and biting. Undiagnosed snoring may lead to an increased tendency for respiratory collapse and sleep apnea. Sleep apnea is a condition in which the back of the throat tissues and muscles collapse into the airways. Untreated sleep apnea patients repeatedly stop breathing during sleep, sometimes hundreds of times during the night, usually lasting one minute or more.