Snoring can be an annoying habit, especially for your partner or roommate, but might not be as harmless as some background noise.  For those living with sleep apnea, snoring can be a serious symptom.  Sleep apnea is when people stop and restart breathing multiple times while sleeping. Sleep apnea is a sleep disorder that is often linked to obesity, especially in the U.S.  According to the National Sleep Foundation, there are over 18 million Americans who suffer from sleep apnea.