The study included 63 men between 30 to 65 years of age who suffered from moderate to severe obstructive sleep apnea.

In obstructive sleep apnea, loud snoring and pauses in breathing are noticed by the bed partner, but the sleeper may have no complaints apart from sleepiness in the day.

Not all snoring is sleep apnea, though heavy snoring is a sign that you should have a sleep test for obstructive sleep apnea.