ResMed explains what causes people to snore and what happens if you stop breathing in your sleep. Snoring can be caused by temporary factors including sedative use, alcohol, seasonal allergies, swollen tonsils and even your sleeping position. Snoring can also be caused by excess weight, particularly around the neck and the shape of your nose and jaw. Snoring can also indicate a much more serious condition, obstructive sleep apnea or OSA which can have serious health implications.